Learning Forum

[givi18]

Hi all. 

 

 

I am doing a simulation for clot formation and I developed 28 UDS. I have to simulate it for 60 minutes. The biggest time step that I can have is 10^-5s.  I am using parallel simulation with 2 cores. (In this situation, the simulation will take a couple of months) When I increase the cores there is no effect on simulation speed. I would appreciate it if any of you could give any advice on how I can increase the speed of my simulation.

I already tried to decrease the under-relaxation factor  (0.3, 0.5,08) and decreased element number, but they didn't have any effect 

[Nikhil N]

Hello,

 

If the flow and the scalars are not critically coupled with each other and are independent, I suggest solving for just the flow first. Once the flow is converged, freeze it, and then solve for the UDSs. This approach can help to reduce the time per iteration, and hence, the overall simulation time.

Furthermore, once the simulation is stable enough, you can consider reducing the number of iterations per time step. This can also help to speed up the simulation process without sacrificing accuracy.

 

Thank you,

Nikhil

[givi18]

 

Hello, 

I already tried to increase the time step after stabilization, but it cause to diverge. 

Do you think if I stop the UDSs for  a while and use the biger timestep for Flow and after while again turn on them and reapt it, I would have a acurate results ?

 

Thank you, 

Peyman