Modelling language for multi-domain physical and control systems.
The free Modelica language is developed by the non-profit Modelica Association. The Modelica Association also develops the free Modelica Standard Library.
Questions tagged [modelica]
1319 questions
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Pressurized vessel in modelica
I've been trying to create a pressurized vessel in openmodelica but i'm stuck.
The block i'm trying to build is a simple vessel for liquid pressurized by gas.
So two input ports (liquid input, gas input) and an output port for pressurized liquid…
Eric Farin
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Classes in Modelica
I have a complex model in Modelica. As I have lots of components in my model, I want to define classes and include some components inside the classes to reduce the complexity of the model. Since I couldn`t find online an example of the use of…
Ulugbey
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Generating two random time depedant veariables with different sample periods
Following this question, I'm trying to generate two time-dependent random functions omega1 and tau using this example. The difference is that I need to have two different sample periods of 0.05 and 0.17 for omega1 and tau respectively. I just…
Foad S. Farimani
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Modelica Flow Simulation says divide by zero
I am trying to simulate the flow in a pipe that starts out partially full, and gradually fills up. Once it is full, the flow equation needs to change. I have tried the following code, but I get a divide by zero error once the pipe is full. …
Adam
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Modelica SemiLinear()
Anyone who knows well Modelica Language, specifically thermo-fluid toolbox? Often there is a semiLinear() function, used to calculate the flow of enthalpy, as it depends flow direction.
Anyone who knows the details of this function, if we can…
user2196166
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1 answer
How to extract values from algorithm section?
I'm working with parabolic PDE's mixed with algebraic equation plus all these equation are coupled.
I used Euler Method (Dassl is too slow) and big tolerance(for fast simulation) and recive error (for both types) in OM(1.9.1)(" residualFcn[some…
Anel
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Pyfmi one step simulation in a for loop?
I'm trying to perform step by step simulation of a fmu in a for loop. The goal is to dynamically change the input of the model coming from python while keeping variables states between loops.
For now I am trying to simulate a battery fmu in a for…
Magleno
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What is the problem with this model ? 4D matrix interpolation
I want to create a 4d matrix and interpolate. Dymola shows me this error for all interp values.
interpX1 (line 40, column 10: erstellte_Bauteile.QuadriLinearInterpolation)
Expected one…
Alex
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1 answer
Error: Compilation of C code failed - Modelica
when I compile my code in Modelica, I get following error:
Command Compile failed with following error: User error: ERROR: java exception in com.modelon.oct.modelica.api.InternalAPIException with message: Compilation of generated C code failed
I…
alimuradpasa
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2 answers
Dymola Issue: "Dymosim.exe has stopped working"
I am running large-scale thermal-fluid system simulation with Dymola 2012.
At the end of simulation I received the following warning message: "Dymosim.exe has stopped working". I could workaround this by clicking the "Close program" (another option…
user2964957
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Is there an open-source heat exchanger library written in Modelica?
Is there an open-source heat exchanger library written in Modelica which covers different types of heat exchangers? Like on this web page https://en.wikipedia.org/wiki/Heat_exchanger
Jack
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