Modelica modeling is the first principle modeling, so how to test the model and set an effective benchmark is important, for example, I could design a fluid network as my wish, but when building a ...

In order to make my model simulation's in Modelica run faster am asking the following quesion : What does impact simulation runtime in Modelica ? i will aprecicate any help possible.

I am using a Dymola OPC server DYMOLA HAS these many tags which can be controlled using SimControl.Run, SimControl.Stop ,etc here i wrote it in MATLAB hostInfo = opcserverinfo('localhost'); da = o...

I build a large model in Dymola, there are nonlinear equations in this model, I wanna know which nonlinear equations decrease the performance and cause an initialization failure, but with the follo...

Wolfram system modeler has a function called "equation browser", the youtube video here(at 20:58) gives an introduction about "equation browser", I am wondering if Dymola has the same function, it ...

I build a Modelica model, but when checking the model (Here is the model download link), it shows a local singularity like in the following screenshot. so I delete the code showed in the error me...

I have a library without annotation (uses(Modelica(version="X.Y.Z"))); in the top level package.mo file. Can I manually execute the conversion script to update my library? And where is it located? ...

Initialization could be very cumbersome and easily lead to divergence. A simple strategy is to run the simulation when building a part of the whole system and use the simulation results to modify g...

There are different Modelica Simulation Environments, including Dymola, Wolfram SystemModeler, OpenModelica, and Jmodelica. So, I try to load a thermal fluid library(ThermoSysPro https://github.com...

My problem is to open some MAT-files generated by Dymola. Some times for small models MATLAB has no problem to open the created MAT-file. Then I can see the structure in the workspace. But I have a...

Please consider the following small Modelica model and function: model VectorizeDemo parameter Integer na=5; final parameter Integer nb=2*na; final parameter Real a[na] = {2*i for i in 1:na}; ...

I am trying to slim down a very complex model to improve performance, and noticed big performance changes when I add or remove variables into the signal bus, especially multi-body frames. I am won...

In https://trac.modelica.org/Modelica/ticket/2229#comment:2 it is mentioned that Dymola has the capability to automatically update a conversion script when changes are applied to a library. I was s...

I try to set up the pyFMI on Anaconda (Python 3.6.8) Installed all the required packages listed on the pyFMI site. The fmu is loaded without the issue but while I try to simulate the fmu I get an...

I noted numerical issues integrating a pulse input that is delayed by a fixed amount of time in Modelica (using Wolfram System Modeler 4.3): model PulseTest "Test FixedDelay with Pulse Input"; ...

I have a simulation model using different components. In order to get a quick overview of the used parameters I use the functionality of annotations to display certain model parameters (e.g. m_flow...

I am attempting to define the parameter of a model (block) as a variable. For example: Real WallThickness = 0.5; Real WallConductance = 10*WallThickness; Modelica.Thermal.HeatTransfer.Components.T...

At work I use git as a version control system and Dymola for modeling and simulation. One major Issue I have is that once I touch or by mistake move a connection (more exactly the position of a pa...

Having run out of ideas again I turn to you. I'm sure this has to have been answered before though for the life of me I can't find a clear description of it. Scenario: You work hard to get a mod...

I wonder if there a way to "debug" a modelica code, I mean debugging the code line by line and you can see how variables change, things like that? I know that the modelica code is translated into...

I want to use non-SI units in a Modelica model in a medical context. I am using Modelica in Dymola. Being an engineer I prefer the SI units. But my model parameters are sourced from medical publica...