As shown in the following code, when the gas reaction rate is much greater than the gas concentration, the gas concentration becomes negative, resulting in an error.

I am using ANSYS Twinbuilder to model a system containing two reservoirs (open tank) connected to their respectives pumps (2) connected to two Mills (opentank). Everything is modelled in modellica. I want to control the flow depending on the plant operation mode, to every possible combination of tanks using discrete valves. The discrete valves contain variables for ex: flowdir_R1M1, meaning it controls the flow from Reservoir 1 to Mill 1. The code produces the following error:

When you model processes with liquid (or gases) there are several reasons to introduce the Modelica stream concept. A major reason is to keep the model balanced at a local level. Another central reason is to allow back-flow. However, in many applications you do not need back-flow and it would be good to turn that possibility off at time of compilation. This would speed-up simulations. A simple example (not shown) of perfusion reactor made both with and without the stream concept gives a time increase of about two with the stream concept allowing for back-flow (in both cases no write on disk). I am not that sure of how representative the example is, but gives an indication.

I wan’t to set up a for loop in OMShell, where i call different models according to the iteration variable of the loop (e.g. ‘i’). To me it looks like i have to find a way to construct the model reference (e.g. mylibrary.mymodel) as a string and convert it (if possible) from String to a reference.

i want to know if it’s possible to simulate a model in OMShell, that is nested inside a package, that i loaded in OMShell via “loadFile()”. None of my attempts doing it via “loadModel()” or “loadFile()” were succesfull.