Drastic change of result per timestep

Discuss advection schemes, timestepping, pressure gradients, coordinates, etc.

Drastic change of result per timestep

Postby saszalez » Fri Nov 26, 2021 7:24 am

Hi everyone. I did a few runs to extract the precipitation from a point for a month, and I found the following situation. If I don't modify anything except the adaptive time step (I have 3 nested domains, and I adjust the time step from 3dx to 5dx), the accumulated precipitation goes from 147mm to 448mm. I have repeated it several times, and the result is correct. I understand that there may be some variation when running faster, but so much is very strange to me. On the other hand, with the wind, for example, there is no variation. Any ideas?
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