# \[RFC / Call for Collaborators\] Multiscale Biophysical Simulation in Julia: Coupling Agents.jl with ODE Stock-Flow (SIMONE Engine)

**URL:** <https://discourse.julialang.org/t/rfc-call-for-collaborators-multiscale-biophysical-simulation-in-julia-coupling-agents-jl-with-ode-stock-flow-simone-engine/140143>\
**Category:** Modelling & Simulations\
**Tags:** agents, simulations\
**Created:** [October 21, 2026, 11:14pm UTC](https://discourse.julialang.org/t/rfc-call-for-collaborators-multiscale-biophysical-simulation-in-julia-coupling-agents-jl-with-ode-stock-flow-simone-engine/140143 "2026-10-21T23:14:17Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![kyberlex](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/kyberlex/32/224356_2.png) [@kyberlex](https://discourse.julialang.org/u/kyberlex)\
**Post date:** [October 21, 2026, 11:14pm UTC](https://discourse.julialang.org/t/rfc-call-for-collaborators-multiscale-biophysical-simulation-in-julia-coupling-agents-jl-with-ode-stock-flow-simone-engine/140143/1 "2026-10-21T23:14:17Z")

</div>

Hi everyone,  
As part of the open-source peer review for the Open Networked Earth (O.N.E.) civilizational framework (repository `kyberlex/ONE` on GitHub), we are seeking Julia modelers, complex systems researchers, and Co-Stewards to review, stress-test, and co-develop our scientific discrete-event co-simulation engine: **SIMONE**.  
SIMONE models socio-technical resilience and biophysical resource allocation across four tightly coupled layers:

1. **Layer 0: Biophysical & Hydrological Substrate** — Darcy aquifer recharge, Penman-Monteith evapotranspiration, hourly solar/wind exergy flux.
2. **Layer 1: Technical-Productive Logistics & BOM** — Stochastic component wear (Weibull MTBF), convex non-monetary resource allocation, and closed-loop material balances.
3. **Layer 2: Heterogeneous Agent-Based Dynamics** — Micro-founded human agents (HEXACO-H psychometrics, Camerer k-depth, labor capacity, bus-factor bottlenecks).
4. **Layer 3: Institutional Finite State Machines** — Statistical sortition councils with odd-parity quorum rotation and non-carceral metabolic clamping.

### **Open Computational & Modeling Doubts:**

1. **Numerical Stability & Stiffness:** Does coupling discrete human agents (via `Agents.jl`) with continuous ODE stock-and-flow systems introduce stiffness, step-size collapses, or numerical divergence when scaling to bioregional clusters (10,000+ agents)?
2. **Event-Driven Degradation:** What is the most idiomatic Julia approach for coupling continuous mass/energy balances with discrete stochastic hardware failures (Weibull MTBF) without intractable allocation overhead?  
Everything is 100% free software and open science (AGPL-3.0, zero commercialization, zero tokens).  
We are actively looking for Julia co-maintainers and invite critics to point out flaws in our assumptions:  
• **Join the Simulation Dialectic:** [[Call for Co-Steward] 3. Simulation & Sandbox Validation (SIMONE) · kyberlex/ONE · Discussion #11 · GitHub](https://github.com/kyberlex/ONE/discussions/11)  
• **Full SIMONE Technical Specification:** [ONE/simone/simone-specs.md at main · kyberlex/ONE · GitHub](https://github.com/kyberlex/ONE/blob/main/simone/simone-specs.md)  
Feedback, suggestions on package architecture, and counter-models are warmly welcomed!