Slow Computation/Simulation Time

Tim S.

Hello all,

 

i am working on a model of the human lumbar spine including ligaments and discs for my masters thesis. I am using 60 virtual cores for the solver. Most of the times the total simulation time is about 30 to 40 minutes. Is there a way to speed this up? My supervisor is also using RADIOSS with 60 cores but it only takes about 5 to 10 minutes. Anyone have an idea what could be the issue? Also, i heard there is a way to split up the cores to run several simulations simultaneously, how does this work exactly? I apologize in advance for any potentially stupid questions, i am still new to FEM.

Cheers, Tim

Adriano_Koga

Hi,

When you say your supervisor is taking much less time, the model is exactly the same?

 

Radioss is highly scalable and it benefits well from more core's. But it also depends on your model size for decomposition. If your model is too small, breaking it into more processors would make it worse..a rule of thumb would be around 5000 elements per core. (By the way don't use virtual core's)

 

Run time in explicit models depends on many aspects, mainly related to timestep.

Timestep can be controlled by elements, nodes, contacts,...

So you should inspect your model .out files to understand what is the bottleneck of your model. In HM you can check critical element timesteps in 'check element' panel, under time.

 

Tim S.

Thankyou for your fast reply Adriano! I think the issue was not in RADIOSS, but in my pc... i actually have been working with only 1 core until now. Glad I found that out thanks to you. Have a good one.