How can I configure the maximum allowed gas velocities

[Ju_Wu]

Dear All,

When I set fluid velocity of mass inflow as 1m/s or 10m/s, it showed me the following errors. How can I configure the maximum allowed gas velocities? Thank you.

mfix - WARNING - velocity higher than maximum allowed velocity: 100.00 mfix - WARNING - velocity higher than maximum allowed velocity: 100.00

[onlyjus]

Please try searching the forum:

Problem with DT

Increase the value of MAX_INLET_VEL_FAC. It may help with intermediate velocity values that exceed the boundary value. The key is available on the Numerics pane under Advanced. You an also find it using the search feature accessed via the question mark (?).

How does MAX_INLET_VEL_FAC work?

From my experience, if you are exceeding MAX_INLET_VEL_FAC then something is probably wrong. Check your setup, BCs, mesh (small cells), chemistry, etc… If you really think that the velocity is correct, then you can change MAX_INLET_VEL_FAC.

[cgw]

There should have been some additional text with that warning message - is that the complete message?

[mariam.yehia33]

Hello,

I have the same problem, and the text only shows this message:
WARNING: velocity higher than maximum allowed velocity (to change this adjust the scale factor MAX_INLET_VEL_FAC)
DT < DT_MIN. Recovery not possible

How can I know the complete error message?

Here is my file:
wang_new_2021-12-23T184828.396229.zip (197.5 KB)

I have also tried increasing MAX_INLET_VEL_FAC from 1 to 1.5, but it didn’t work either and the case diverges immediately when I resume.

Thanks,
Mariam

[cgw]

As Justin said above:

Check your setup, BCs, mesh (small cells), chemistry, etc.

And if those are all correct, set the MAX_INLET_VEL_FAC to something higher than 1.5, try, 5 or 10.