Learning Forum

[desouzadacosta]

Hi All

Can anybody share some ideas about decreasing the peak values of continuity residual for a transient simulation ?

It is going like the picture :

[Rob]

How many iterations are you needing per time step? Aim to converge a step in 10-15 iterations. n

[desouzadacosta]

Hi Rob,nNow things are getting worse. The continuity residuals are exploding after being stable for several thousands iterations (see picture)nAny clue for workarounds ?nn

[DrAmine]

It looks like you are using Windkessel ACT?n Now it is hard to say what can be done here: I will first check mesh, boundaries if all is consistent and try using smaller time step size. Does it diverge without using that Windkessel Model?n

[desouzadacosta]

Hi DrAminenThanks for the output.nIf I replace for a simple pressure outlet, it goes. Unfortunatelly, I should use windkessel for a more realistic simulation. n

[DrAmine]

You might need to add more relaxation and/or adjusting the windkessel UDF's. You might code that on your own using your own UDF or some expressions.n

[pen m]

Hello, you have the code of the Windkessel model. There are some problems in the code I wrote. If possible, please send it to my email 972539894@qq.com, thank you.