Getting different results with different number of cores
 

Hello REEF3D-team,
I used 20-cores and 8-cores to run the same simulation problem, it is generating different results. For instant, the drag load amplitude increases for 20-cores as compared to 8-cores, as shown in attached figure.
I am attaching the control and ctrl txt file as well.


Thank you

Regards
Keshav

Thanks for the feedback! We are looking at this and will get back to you soon.

Hello Team REEF3D
Any update in this regard?

Thank you

Regards
KP

We did some testing on this. In order to avoid the difference, could you try with G 3 1 - i.e. turn on direct forcing?

I tried to measure air pressure inside an oscillating water column as it interacts with waves in a 3D numerical wave tank.

First, I ran a simulation with 80 cores, and the results showed a very different profile as seen in the figure. Then, I ran the simulation again with just 8 cores, keeping everything else the same, and this time the results looked more reliable.

After reading your response on this page, I tried a different approach by using the solid forcing method instead of the immersed boundary method. However, I couldn't get any pressure data using this method, even though I kept all other settings unchanged.

I'm using REEF3D-23.03-release_candidate on an HPCE facility. Can you please take a look at the graph and input files I've attached and provide some suggestions?