Hello,
I currenty work on a FSI (Fluid-Structure-Interaction) using Ansys 18.1. After a lot of efford I succeded at a working simulation, but it takes a high computation duration. With Ansys Fluent, a simple simulation with around 500k elements in CFD and 30k elements in Mechanical takes 67h with only 10 time steps (75 iterations).
I want to improve the speed of the computation, but I cannot find any setting in order to do this. In Fluent I selected parallel computing with 4 cores. Even with GPGPU support, there is no significant duration improvement. During the project, I have a max CPU perfomance of 20%. The CFD simulation with Fluent, without FSI takes around 1h.
Has anyone an idea for a FSI simulation? I use the pressure-based solver with the coupled setting and second order implicit transient. The dynamic mesh is generated by smoothing (diffusion).
By request, there is more information, if needed.
Kind regards,
Hi Karl,
Here the first question is, are you doing one way FSI or two way? means on each time step data is being transferred from Fluent to Ansys Structural or just you are calculating only from Fluent and transferring your results to Ansys structural of vise versa? Because of computed time i assume you are working of two way but please make sure about it.
I will also recommend you to run Ansys Structural separately like you did with fluent (you didn't mention how much time step you are solving only in fluent only 10 time steps?) by mimicking the load from fluent and see how much time it is taking. If that one is also not taking much time then there is issue in transferring data between the two modules of Ansys.
Hi Muhammad,
Sorry for not mentioning that detail: I am using a two way FSI.
Structural, Fluent and system coupling are set separately to 10 time steps. But, as explained in the tutorials and handbooks for for system coupling, all parameters from Fluent and Structural are overwritten due to system coupling.
I also let the structural model run separately and it was done in seconds. I guess the problematic aspects are the dynamic mesh and the data transfer. Is there a proper option for improving duration or is it possible to let Ansys use all computations resources of the PC?
Kind regards
Hello
check how many cores is your computer and turn off hyper threading
may be that helps
what is the simulation you are performing
Hi,
thanks for the answer, I already managed to use all cores on the CPU. I will try to turn off hyper threading in Windows and ANSYS.
I want to simulate the transient interaction of a Micro Pillar (fuselage flow) in laminar flow.
Kind regards,
Karl T
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