[SirIsaac90]

Hello everyone!

I wrote a new solver for incompressible flows with Runge-Kutta methods for time discretization implemented.
My problem is that I want to write in fvSchemes or controlDict a number which stands for a specific Runge-Kutta method. This number shall be transferred to my solver. Inside the solver with this number the specific Runge-Kutta method is chosen and the computation with this Runge-Kutta method starts.

Can anyone help me how to do that? How do I have to declare the variable?
I would be very thankful for any advices!


Regards

Justin

[tomislav_maric]

Originally Posted by SirIsaac90

Hello everyone!

I wrote a new solver for incompressible flows with Runge-Kutta methods for time discretization implemented.
My problem is that I want to write in fvSchemes or controlDict a number which stands for a specific Runge-Kutta method. ...

So basically you want to select a Runge-Kutta (RK) method based on an entry in the dictionary file. Here are a few pointers

1. Encapsulate the RK methods into classes if you already haven't done that. You don't have to follow the design of ddtSchemes in OpenFOAM, you can start by implementing your own classes as the first try.
2. Identify the different RK methods with names (strings, words) and not numbers, since they are identified with different names in the "real world".
3. Use the Run-time Type Selection mechanism to make your RK method classes run-time selectable.
   1. Implement a constructor in the RK class that takes a dictionary constructor.
   2. Add your RK method dictionary as a sub-dictionary of any dictionary file, it can be controlDict, fvSchemes, whereve you think it should go.
   3. Select the scheme like in the tutorial above, by passing the sub-dict as the argument to the New selector.

[SirIsaac90]

Hi!

This is exactly the thing I want to do.

I will try that out these days. Thank you very much !!

Best regards!