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mbkuhn avatar mbkuhn commented on September 25, 2024

Because this fails at the first projection, and bad values of Min u and Max v appear before the projection, I wonder if the initialization is faulty. Do you have sampling or plt data at the 0 timestep? If those look fine, it will be pretty conclusive that the faulty data comes in via the source terms that are used prior to the MAC projection.

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moprak-nrel avatar moprak-nrel commented on September 25, 2024

I can reproduce this behavior consistently. The plt file at the 0 timestep is consistent between the working CPU simulation and the failing GPU run. So this is most likely from the source terms.

==============================================================================
Step: 1 dt: 0.5 Time: 0 to 0.5
CFL: 0.308108 (conv: 0.308108 diff: 0 src: 0 )

L-inf norm summary: before predictor step
..............................................................................
Level 0
  velocity                 4.065279426         12.32432027                   0
  gp                                 0                   0                   0
  temperature                      305
  tke                              0.1
..............................................................................


Godunov:
  System                     Iters      Initial residual        Final residual
  ----------------------------------------------------------------------------

L-inf norm MAC vels: before MAC projection
..............................................................................
Max u:           -100000000 |  Location (x,y,z):          0,          0,          0
Min u:                 -inf |  Location (x,y,z):          0,          0,          0
Max v:                  inf |  Location (x,y,z):          0,          0,          0
Min v:            100000000 |  Location (x,y,z):          0,          0,          0
Max w:             0.040875 |  Location (x,y,z):        950,        950,        940
Min w:                    0 |  Location (x,y,z):        950,        950,        960
..............................................................................

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moprak-nrel avatar moprak-nrel commented on September 25, 2024

In my test runs, I can reliably get the MMC forcing to work on GPUs with #1085 , @lawrenceccheung please re-open this still hasn't fixed it.

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