# \#modelling

**URL:** https://discourse.julialang.org/tag/modelling/1032.md

[Latest](https://discourse.julialang.org/latest.md) · [Categories](https://discourse.julialang.org/categories.md) · [Tags](https://discourse.julialang.org/tags.md)

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## [Post-doc position at the GHER, ULiège, Belgium](https://discourse.julialang.org/t/post-doc-position-at-the-gher-uliege-belgium/139159)

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**Author:** [@Alexander-Barth](https://discourse.julialang.org/u/Alexander-Barth)\
**Replies:** 0\
**Last updated:** [September 2, 2026, 8:38am UTC](https://discourse.julialang.org/t/post-doc-position-at-the-gher-uliege-belgium/139159 "2026-09-02T08:38:24Z")

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We invite applications for a project scientist (post-doc) position at the GeoHydrodynamics and Environment Research group (GHER, https://www.gher.uliege.be) of the University of Liège in Belgium. The candidate will work …

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## [\[ANN\] ReactionDiffusion.jl v1.0.0 - Simulation and visualization for 1D reaction-diffusion systems](https://discourse.julialang.org/t/ann-reactiondiffusion-jl-v1-0-0-simulation-and-visualization-for-1d-reaction-diffusion-systems/139041)

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**Author:** [@homocarbonis](https://discourse.julialang.org/u/homocarbonis)\
**Replies:** 0\
**Last updated:** [August 25, 2026, 6:36pm UTC](https://discourse.julialang.org/t/ann-reactiondiffusion-jl-v1-0-0-simulation-and-visualization-for-1d-reaction-diffusion-systems/139041 "2026-08-25T18:36:45Z")

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I’d like to announce a brand new version of ReactionDiffusion.jl, a general purpose toolkit for anyone interested in modelling reaction-diffusion systems on a 1D domain. This release builds on the design of its predece…

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## [\[ANN\] Sirens.jl - Hybrid and multiscale simulations](https://discourse.julialang.org/t/ann-sirens-jl-hybrid-and-multiscale-simulations/139037)

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**Author:** [@mjowen](https://discourse.julialang.org/u/mjowen)\
**Replies:** 0\
**Last updated:** [August 25, 2026, 11:01am UTC](https://discourse.julialang.org/t/ann-sirens-jl-hybrid-and-multiscale-simulations/139037 "2026-08-25T11:01:22Z")

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I am happy to announce Sirens.jl, a new package for constructing and running hybrid and multiscale simulations. Simulations in Sirens.jl consist of multiple concurrently run models, each with their own solver, allowi…

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## [\[ANN\] Glenn.jl v0.30 — Thermochemical properties calculator from NASA Glenn coefficients](https://discourse.julialang.org/t/ann-glenn-jl-v0-30-thermochemical-properties-calculator-from-nasa-glenn-coefficients/138618)

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**Author:** [@R.Leao.Jr](https://discourse.julialang.org/u/R.Leao.Jr)\
**Replies:** 11\
**Last updated:** [August 24, 2026, 3:32am UTC](https://discourse.julialang.org/t/ann-glenn-jl-v0-30-thermochemical-properties-calculator-from-nasa-glenn-coefficients/138618 "2026-08-24T03:32:13Z")

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I’m happy to announce Glenn.jl v0.30, a Julia package that computes thermochemical properties (Cp(T) , H°(T), S°(T)) from NASA-7 polynomial coefficients stored in a bundled SQLite database. The package is a Julia port o…

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## [\[ANN\] SolarPosition.jl](https://discourse.julialang.org/t/ann-solarposition-jl/134263)

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**Author:** [@langestefan](https://discourse.julialang.org/u/langestefan)\
**Replies:** 24\
**Last updated:** [July 31, 2026, 6:59pm UTC](https://discourse.julialang.org/t/ann-solarposition-jl/134263 "2026-07-31T18:59:20Z")

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I am excited to announce the release of my first public Julia package, SolarPosition.jl. TLDR SolarPosition.jl is a common interface to a variety of solar positioning algorithms which have been rewritten from scratch in…

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## [Making a Universal Differential Equation Faster](https://discourse.julialang.org/t/making-a-universal-differential-equation-faster/137829)

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**Author:** [@Ashima\_Kalathingal](https://discourse.julialang.org/u/Ashima_Kalathingal)\
**Replies:** 1\
**Last updated:** [June 28, 2026, 1:57am UTC](https://discourse.julialang.org/t/making-a-universal-differential-equation-faster/137829 "2026-06-28T01:57:32Z")

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I have a two-state ODE, one of which is embedded in a neural network, making it a UDE. I am using 9 datasets for training, resulting in 9 distinct ODEs. prob1 = ODEProblem(UDE\_model1!,\[SOC0\_1, T∞1\],(time1\[1\],time1\[end\])…

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## [ElasticWave2D.jl - 2D seismic wave simulation on your laptop](https://discourse.julialang.org/t/elasticwave2d-jl-2d-seismic-wave-simulation-on-your-laptop/135349)

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**Author:** [@Wuheng10086](https://discourse.julialang.org/u/Wuheng10086)\
**Replies:** 0\
**Last updated:** [January 30, 2026, 2:32pm UTC](https://discourse.julialang.org/t/elasticwave2d-jl-2d-seismic-wave-simulation-on-your-laptop/135349 "2026-01-30T14:32:30Z")

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Hi, everyone! I made ElasticWave2D.jl — GPU-accelerated 2D elastic wave simulation in Julia. I wanted to explore Julia’s potential for seismic simulation — easy install, GPU support, and readable code. Features: C…

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## [\[ANN\] SINDBAD Terrestrial Ecosystem Model-Data Integration Framework and Related Packages](https://discourse.julialang.org/t/ann-sindbad-terrestrial-ecosystem-model-data-integration-framework-and-related-packages/134896)

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**Author:** [@dr-ko](https://discourse.julialang.org/u/dr-ko)\
**Replies:** 2\
**Last updated:** [January 14, 2026, 10:53pm UTC](https://discourse.julialang.org/t/ann-sindbad-terrestrial-ecosystem-model-data-integration-framework-and-related-packages/134896 "2026-01-14T22:53:44Z")

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After many years of development, we (all current and previous SINDBAD developers) are excited to announce the release of the SINDBAD (Strategies to INtegrate Data and Biogeochemical moDels) suite of Julia packages for te…

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## [CasADiNLPModels.jl: an interface for CasADi via loading code generated functions](https://discourse.julialang.org/t/casadinlpmodels-jl-an-interface-for-casadi-via-loading-code-generated-functions/133925)

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**Author:** [@apozharski](https://discourse.julialang.org/u/apozharski)\
**Replies:** 1\
**Last updated:** [November 19, 2025, 11:35am UTC](https://discourse.julialang.org/t/casadinlpmodels-jl-an-interface-for-casadi-via-loading-code-generated-functions/133925 "2025-11-19T11:35:02Z")

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We (@frapac, @apozharski, and Armin Nurkanović) have released a small new package for easily interfacing NLPs modeled in CasADi with the NLPModels.jl ecosystem. The package implements loading of CasÄDi code generated fun…

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## [Identification using LowLevelParticleFilters.jl](https://discourse.julialang.org/t/identification-using-lowlevelparticlefilters-jl/132393)

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**Author:** [@langestefan](https://discourse.julialang.org/u/langestefan)\
**Replies:** 19\
**Last updated:** [October 17, 2025, 1:04pm UTC](https://discourse.julialang.org/t/identification-using-lowlevelparticlefilters-jl/132393 "2025-10-17T13:04:10Z")

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I am looking for an example (or some guidance) on how to fit a Kalman smoother to data using log-likelihood maximization using LowLevelParticleFilters.jl. I already have a model structure and have collected a dataset. I…

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## [Scientific Computing Engineer for the Dynamic Systems group at UMR MISTEA - INRAE in Montpellier, France](https://discourse.julialang.org/t/scientific-computing-engineer-for-the-dynamic-systems-group-at-umr-mistea-inrae-in-montpellier-france/132288)

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**Author:** [@dmetivie](https://discourse.julialang.org/u/dmetivie)\
**Replies:** 2\
**Last updated:** [September 20, 2025, 1:09pm UTC](https://discourse.julialang.org/t/scientific-computing-engineer-for-the-dynamic-systems-group-at-umr-mistea-inrae-in-montpellier-france/132288 "2025-09-20T13:09:16Z")

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INRAE (French National Research Institute for Agriculture, Food and Environment) is hiring a Scientific Computing Engineer for the Dynamic Systems group at UMR MISTEA (my lab) in Montpellier, France. Key points: Focus…

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## [Smooth progress bar for multithreads sampling in turing.jl](https://discourse.julialang.org/t/smooth-progress-bar-for-multithreads-sampling-in-turing-jl/130768)

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**Author:** [@Sahil\_Khan](https://discourse.julialang.org/u/Sahil_Khan)\
**Replies:** 6\
**Last updated:** [July 26, 2025, 1:13pm UTC](https://discourse.julialang.org/t/smooth-progress-bar-for-multithreads-sampling-in-turing-jl/130768 "2025-07-26T13:13:42Z")

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Hello everyone, Im working with turing.jl and what I have noticed that when sampling multiple chains with mulithreads option. Progress bar show progress based on number of chains used for example if I use 3 chains then …

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## [MTK Control System with Current Not Working](https://discourse.julialang.org/t/mtk-control-system-with-current-not-working/129558)

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**Author:** [@madtorresga](https://discourse.julialang.org/u/madtorresga)\
**Replies:** 1\
**Last updated:** [June 2, 2025, 1:17pm UTC](https://discourse.julialang.org/t/mtk-control-system-with-current-not-working/129558 "2025-06-02T13:17:26Z")

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Hello! I’m trying to implement this exact same example, but controlling with the current that passes through the resistance instead of the speed in speed\_sensor.w. @equations begin #... #connect(curre…

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## [Acausal Modelling and Control Sytem](https://discourse.julialang.org/t/acausal-modelling-and-control-sytem/127003)

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**Author:** [@AndhikaTama](https://discourse.julialang.org/u/AndhikaTama)\
**Replies:** 22\
**Last updated:** [May 4, 2025, 3:39pm UTC](https://discourse.julialang.org/t/acausal-modelling-and-control-sytem/127003 "2025-05-04T15:39:55Z")

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Hello everyone, I am a new user of Julia ModelingToolkit and ControlSystem. I am currently working on a project with the topic Nonlinear Dynamic Simulation of a MicroGas Turbine Integrated with Concentrated Solar Therma…

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## [\[ANN\] LikelihoodProfiler.jl Major Upgrade](https://discourse.julialang.org/t/ann-likelihoodprofiler-jl-major-upgrade/127050)

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**Author:** [@ivborissov](https://discourse.julialang.org/u/ivborissov)\
**Replies:** 2\
**Last updated:** [March 24, 2025, 2:36pm UTC](https://discourse.julialang.org/t/ann-likelihoodprofiler-jl-major-upgrade/127050 "2025-03-24T14:36:45Z")

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Hi everyone, We have released a new version of LikelihoodProfiler.jl, which represents a major redevelopment of the package. In its initial (old) version, LikelihoodProfiler.jl provided a method (CICO) for estimating c…

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## [\[ANN\] VortexStepMethod.jl Aerodynamic models of 3D wings using the Vortex Step Method](https://discourse.julialang.org/t/ann-vortexstepmethod-jl-aerodynamic-models-of-3d-wings-using-the-vortex-step-method/126442)

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**Author:** [@Bart\_van\_de\_Lint](https://discourse.julialang.org/u/Bart_van_de_Lint)\
**Replies:** 4\
**Last updated:** [March 1, 2025, 1:50am UTC](https://discourse.julialang.org/t/ann-vortexstepmethod-jl-aerodynamic-models-of-3d-wings-using-the-vortex-step-method/126442 "2025-03-01T01:50:17Z")

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The Vortex Step Method (VSM) is an enhanced lifting line method that improves upon the classic approach by solving the circulation system at the three-quarter chord position, among the most important details. This adjust…

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## [Gurobi.jl numerical trouble in optimal power flow](https://discourse.julialang.org/t/gurobi-jl-numerical-trouble-in-optimal-power-flow/125267)

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**Author:** [@langestefan](https://discourse.julialang.org/u/langestefan)\
**Replies:** 5\
**Last updated:** [January 27, 2025, 9:29pm UTC](https://discourse.julialang.org/t/gurobi-jl-numerical-trouble-in-optimal-power-flow/125267 "2025-01-27T21:29:06Z")

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Hi. I am trying to model one of the ‘classic’ conic relaxations of the optimal powerflow model (see Branch Flow Model: Relaxations and Convexification—Part I) The problem I am running into is that depending on the loads…

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## [\[ANN\] LatentClassAnalysis.jl - Latent Class Analysis in Julia](https://discourse.julialang.org/t/ann-latentclassanalysis-jl-latent-class-analysis-in-julia/121814)

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**Author:** [@yanwenwang24](https://discourse.julialang.org/u/yanwenwang24)\
**Replies:** 8\
**Last updated:** [January 9, 2025, 7:53am UTC](https://discourse.julialang.org/t/ann-latentclassanalysis-jl-latent-class-analysis-in-julia/121814 "2025-01-09T07:53:57Z")

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Hi all! :waving\_hand:t3:I’m happy to announce LatentClassAnalysis.jl, a package I’ve developed for Latent Class Analysis (LCA). Key Features This package can do: Model specification with dummies or categorical indica…

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## [Examples of well-established ABMs for economics/finance](https://discourse.julialang.org/t/examples-of-well-established-abms-for-economics-finance/121301)

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**Author:** [@Datseris](https://discourse.julialang.org/u/Datseris)\
**Replies:** 6\
**Last updated:** [October 17, 2024, 7:59am UTC](https://discourse.julialang.org/t/examples-of-well-established-abms-for-economics-finance/121301 "2024-10-17T07:59:48Z")

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Hello there! I am currently developing a small project for a student doing an MSc in Mathematics & Finance. Project is akin to a Master Thesis but 3-months long only. The goal of the project is to engage the student into…

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## [JuMP design question](https://discourse.julialang.org/t/jump-design-question/123927)

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**Author:** [@langestefan](https://discourse.julialang.org/u/langestefan)\
**Replies:** 7\
**Last updated:** [December 19, 2024, 6:03pm UTC](https://discourse.julialang.org/t/jump-design-question/123927 "2024-12-19T18:03:30Z")

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Hi, I am building a model which is made up of smaller models. The smaller model definition can be found here: JuMP: which solver should I use for my problem? For context, the model linked above is a heat pump h which c…

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## [ERROR: Tried to remove agent with ID 66 from the space, but that agent is not on the space](https://discourse.julialang.org/t/error-tried-to-remove-agent-with-id-66-from-the-space-but-that-agent-is-not-on-the-space/122674)

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**Author:** [@Sahil\_Khan](https://discourse.julialang.org/u/Sahil_Khan)\
**Replies:** 7\
**Last updated:** [December 11, 2024, 5:12pm UTC](https://discourse.julialang.org/t/error-tried-to-remove-agent-with-id-66-from-the-space-but-that-agent-is-not-on-the-space/122674 "2024-12-11T17:12:25Z")

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I was wondering what is most efficient and issue free way to create random positions for agents. At the moment Im using this where sides = \[1e3, 1e2, 5e2\] positions = \[sides .\* rand(SVector{3,Float64}) for \_ in 1:num…

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## [Solid boundary for ABM model](https://discourse.julialang.org/t/solid-boundary-for-abm-model/113984)

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**Author:** [@Sahil\_Khan](https://discourse.julialang.org/u/Sahil_Khan)\
**Replies:** 28\
**Last updated:** [December 10, 2024, 1:18pm UTC](https://discourse.julialang.org/t/solid-boundary-for-abm-model/113984 "2024-12-10T13:18:07Z")

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Hello everyone, I’m building a model where particles roam around randomly in 3d space. At the moment issue is that I want particles to be contained in space though what I see is that it escapes boundary and comes on the…

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## [Generating C code from JuMP.jl model](https://discourse.julialang.org/t/generating-c-code-from-jump-jl-model/122736)

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**Author:** [@langestefan](https://discourse.julialang.org/u/langestefan)\
**Replies:** 7\
**Last updated:** [November 17, 2024, 10:20pm UTC](https://discourse.julialang.org/t/generating-c-code-from-jump-jl-model/122736 "2024-11-17T22:20:53Z")

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I have defined an MILP model in JuMP.jl. This model works great. Now I would like to implement it on a real time controller in C. Is there a way to generate C code for my model so that I can just copy paste it into my p…

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## [Julia ❤️ ABM tutorial series](https://discourse.julialang.org/t/julia-abm-tutorial-series/99300)

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**Author:** [@fbanning](https://discourse.julialang.org/u/fbanning)\
**Replies:** 1\
**Last updated:** [November 17, 2024, 5:23pm UTC](https://discourse.julialang.org/t/julia-abm-tutorial-series/99300 "2024-11-17T17:23:37Z")

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Julia :heart: ABM is a tutorial series on coding agent-based models in Julia. I write on it in irregular intervals - basically whenever I find some time to extend on it. List of issues so far: Julia :heart: ABM #0: Ag…

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## [Multibody modeling in ModelingToolkit using Multibody.jl](https://discourse.julialang.org/t/multibody-modeling-in-modelingtoolkit-using-multibody-jl/119858)

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**Author:** [@baggepinnen](https://discourse.julialang.org/u/baggepinnen)\
**Replies:** 0\
**Last updated:** [September 25, 2024, 12:25pm UTC](https://discourse.julialang.org/t/multibody-modeling-in-modelingtoolkit-using-multibody-jl/119858 "2024-09-25T12:25:56Z")

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Multibody modeling in ModelingToolkit using Multibody.jl I’m happy to announce that the repository of Multibody.jl has just been made public. Multibody.jl is a component library for ModelingToolkit that allows you to mod…

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## [Extracting each iteration result in KissABC.jl](https://discourse.julialang.org/t/extracting-each-iteration-result-in-kissabc-jl/118658)

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**Author:** [@Sahil\_Khan](https://discourse.julialang.org/u/Sahil_Khan)\
**Replies:** 4\
**Last updated:** [September 5, 2024, 1:34pm UTC](https://discourse.julialang.org/t/extracting-each-iteration-result-in-kissabc-jl/118658 "2024-09-05T13:34:45Z")

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Hello everyone, I was wondering Is it possible to extract results from each iteration in smc( ) run in kissABC package ? I was reading the documentation link but I don’t see much there. Thank you :slight\_smile:

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## [Large allocation problem while simulating agents model](https://discourse.julialang.org/t/large-allocation-problem-while-simulating-agents-model/118522)

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**Author:** [@Sahil\_Khan](https://discourse.julialang.org/u/Sahil_Khan)\
**Replies:** 12\
**Last updated:** [August 23, 2024, 2:18pm UTC](https://discourse.julialang.org/t/large-allocation-problem-while-simulating-agents-model/118522 "2024-08-23T14:18:30Z")

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Hello, This is a continuation of previous thread multithreading in agents. I have put an example here which overall is weird as a model but gives idea of memory allocation regions in my original model. Please ignore if y…

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## [Running EBM model in a function](https://discourse.julialang.org/t/running-ebm-model-in-a-function/117512)

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**Author:** [@Sahil\_Khan](https://discourse.julialang.org/u/Sahil_Khan)\
**Replies:** 1\
**Last updated:** [July 29, 2024, 9:28am UTC](https://discourse.julialang.org/t/running-ebm-model-in-a-function/117512 "2024-07-29T09:28:25Z")

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Hello everyone, Im running EBM model inside a function which is causing issue with calling model properties values. Is there a way to extract them inside function? General Idea of my function: model = model\_initiate()…

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## [Errors Encountered While Running Examples from FMIFlux.jl Documentation](https://discourse.julialang.org/t/errors-encountered-while-running-examples-from-fmiflux-jl-documentation/116905)

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**Author:** [@CurioMath](https://discourse.julialang.org/u/CurioMath)\
**Replies:** 1\
**Last updated:** [July 12, 2024, 11:36am UTC](https://discourse.julialang.org/t/errors-encountered-while-running-examples-from-fmiflux-jl-documentation/116905 "2024-07-12T11:36:06Z")

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I have been trying to run the examples provided in the documentation of FMIFlux.jl, loading models from FMIZoo.jl. However, I often face errors while executing the following lines of code from the documentation examples. …

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## [Running agents.jl model with run!()](https://discourse.julialang.org/t/running-agents-jl-model-with-run/116477)

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**Author:** [@Sahil\_Khan](https://discourse.julialang.org/u/Sahil_Khan)\
**Replies:** 6\
**Last updated:** [July 2, 2024, 1:01pm UTC](https://discourse.julialang.org/t/running-agents-jl-model-with-run/116477 "2024-07-02T13:01:10Z")

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How can I avoid saving data after run in agent based model. I thought if we don’t give adata. It should automatically not save data and its not saving as in end dataframes are 0\*0 in size but its taking same amount of t…

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