[melodia]

Hi,

I have a problem which does not affect convergence but makes it very slow.

The pressure is a set parameter and testing different temperature values, the error is the same. What could be the problem?

Error that comes up is: time-step limited by negative densities, recovering .....

Thanks in adavance

[Yaju]

Hi melodia,

This time-step limitation rarely occurs, but it can be due to very high mass flux out of the cell such that density in a cell goes negative while solving the density transport equation (mass conservation).

What is the max_cfl_u in your simulation?