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The Navier-Stokes equations, which describe the motion of fluid substances such as liquids and gases, are fundamental to the field of fluid dynamics. However, several challenging problems related to t…
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The model IBPSA.Fluid.Interfaces.Examples.Humidifier_u shows oscillations if simulated with CVODE:
![image](https://user-images.githubusercontent.com/1329080/98037002-cd049f00-1dcf-11eb-8c25-be8367…
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Hi all,
I try to solve a non linear equation but it conitnues running since 48 hours now.
```
import sympy as sp
X = sp.MatrixSymbol('X',2,2)
W = sp.MatrixSymbol('W',2,2)
Y = sp.MatrixSymb…
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how to solve a system of nonlinear equations using this project
┆Issue is synchronized with this [Trello card](https://trello.com/c/nbTy7vde) by [Unito](https://www.unito.io)
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A recent paper by @bernhardbachmann and @casella ([DOI:10.1016/j.amc.2021.125991](https://doi.org/10.1016/j.amc.2021.125991), [DOI:10.48550/arXiv.1911.12433](https://doi.org/10.48550/arXiv.1911.12433)…
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This looks like a good spot to implement equation solving. Similar to https://docs.sympy.org/latest/modules/solvers/solvers.html .
- [ ] Polynomials
- [ ] Nonlinear 1D equations
- [ ] Systems of …
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We are implementing FanPT. The basic idea is in the [recent paper](https://pubs.acs.org/doi/full/10.1021/acs.jpca.4c00855).
Recall that the FanCI equations are
$$
\braket{\mathbf{m}|\hat{H}|\Ps…
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Hi, it seems that the `.subs` function is quite slow. When I have a long expression `e` (can contain nonlinear terms like `x**2, y*x*z`), calling `e.subs(some_dict)` takes some noticeable time (two se…
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**Reported by victor.avila on 28 Jan 2016 08:56 UTC**
In the model [SimpleMSLpump.mo](https://github.com/modelica/ModelicaStandardLibrary/files/2048363/SimpleMSLpump.zip), one simple MSL pump an…