Hey, I have a fully converged steady state Simulation and want use this solution as my initial Solution for my unsteady Simulation. The mesh hasn't change. So the manual just say: Domain of row/ initial Sol/ Typ of initialization and then from Solution and then I choose the Simulation. Do I need to make any other settings ?
So i copied the steady state simulation project, changed it to transient simulation and applied the above step. In the steady state case I used the multigrid method ( 3 levels ) and the CPU booster . If I now read in the steady state solution and also want to work with multigrid and CPU Booster I unfortunately get an error message from the beginning: error: residual of mass is not a number: solver has stopped, some NAN have been detected. I reduced the CFL Number from 100 to 10 and the same problem.
if i have only one multigrid level in the unsteady simulationand use the cpu booster at the same time i don't get the error message anymore. But even with the cpu booster the simulation crashes at some point. I can only do the transient simulation without multigrid and cpu booster but I don't understand why.
You should be able to use a steady solution as initial solution for an unsteady one. The steps you follow seem correct; have you tried changing the time step in the unsteady run to see if this has an effect?
hey, I found the mistake. Forget to implement a depence to the time. I will need OpenLabs to implement a boundary condition that changes with time or ?