[deal.II] Adding friction to Step 42

Hi, I'm trying to add friction to the step 42. What would be the most efficient way to add friction to this step. What modules do I need to change? Any suggestions would be highly appreciated. Thanks Reza -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum

[deal.II] Matrix construction for vector valued problems

Hello, As my first question (which is an elementary math level question) and considering step-20 as an example, I was wondering how two equations (bilinear forms) containing two unknowns can be summed up to a single equation? While for example in the case of a system of two linear equations it

[deal.II] Re: MatrixFree & complex-valued Helmholtz equation

Dear all, I still have issues figuring out how to have access to the component index when doing a MatrixFree implementation with complex values. I would really appreciate it if someone could help me. Thank you very much Regards, H El miércoles, 13 de octubre de 2021 a las 19:07:07 UTC+3,