The choice of time step options

HiFiLES / HiFiLES-solver

High Fidelity Large Eddy Simulation Solver

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The choice of time step options #95

Closed hzhf closed 8 years ago

hzhf commented 9 years ago

When setting dt_type = 1 (global step time), the residual results calculated on CPUs and GPUs for the same simulations are different. why is it？？？

jewatkins commented 9 years ago

Hi hzhf,

Thanks for your question. Unfortunately, global CFL based time stepping hasn't been implemented yet on the GPU code. If you attempt to use global CFL based time stepping on the GPU, I believe it uses the specified time step in the input file.

Also, the local time stepping implementation on the CPU is different than the one implemented on the GPU. You may run into different residuals here too.

-Jerry