Learning Forum

[kiki1]

topic: Calculation time rationality consultation

key words: solidification&melting model, calculation time estimation

Detailed settings:

grid size(cells): 6000~7000

general set: transient calculation

Models: solidification&melting ,consider gravity, and use the Boussinesq approximation to deal with convection phenomena

solution methods: system default

Time step set:

 Time stepping method: Adaptive

 Max Iterations/Time step: 50

 reporting interval、profile update interval: 50

Computing resources: CPU: 4-core intel(R)core(TM) i5-9500 [email protected] RAM：8GB

Pre-calculation: It takes 3 days to simulate 5000s.

Questions:

1. The target is simulated for 3 days (259200s). According to the previous simulation time, if the calculation speed remains unchanged, the calculation is expected to be completed in a total of 155.52 days. Is this reasonable? If not, what is the problem?

2. If the time is reasonable, how to speed up the calculation?

[Rob]

It's not a bad first estimate. With 7k cells use 1-2 cores, as I suspect the data passing is going to outweigh the benefit of more compute. Check the solution time scales: time step is determined by the flow (or other scalar) speed and cell size.