[hand90]

Hi

In my simulation I would like to modify/change the temperature field after a certain time. For multiple reasons I cannot do this at the inlet and therefore I am using a subdomain. With the help of a energy source term I was able to inject energy into the system. The energy then creates the desired change in temperature.
The problem is that the injected energy also creates a pressure wave which travels both up- and downstream in the domain. The attached picture (Picture1) shows the created pressure wave (top) when introducing the temperature fluctuation (bottom).
When using NRBC at the outlet the pressure wave will eventually exit the domain. However in a more complex situation this pressure wave will reflect of the geometry which will mess up my results.
I need a situation shown in Picture 2 where there is no pressure fluctuation present but a temperature fluctuation.

Is there a way I can change the temperature field without causing this pressure wave?

Your help will be much appreciated!