[srinivas15]

after doing itreation suddenly got reversed flow and divergence detected in amg solver (this subsonic case). what should i do


somebody help me

[amin.z]

Usually this points could prevent the solution from divergence:
1. A good initializiation
2. Decreasing under relaxation factors and courant number
3. Selecting an appropriate discrete method
And etc!

Also sure that your BCs be ok!

[srinivas15]

and also i got one error non positive volume

[amin.z]

Originally Posted by srinivas15

and also i got one error non positive volume

it's occurred because volume of at least one cell is negative!
Usually grid generation is reason of this problem!
Do you check your mesh when import its to fluent?
If there are negative cells in first step it's better to repeat mesh generation again!
and if you're solving a dynamic mesh i think you must update your mesh during the solution!

[srinivas15]

thank you sir,
i got it