[pastarox]

Hi all,

I'm a novice at FLUENT, and i'm having trouble getting my solution to converge.

I'm trying to do a heat transfer analysis on a 3D mesh, and I keep getting this error:
# Divergence detected in AMG solver: temperature -> Increasing relaxation sweeps!

I've tried changing the URF and the limit of the temperature.

Any ideas?

[xrs333]

try to reinitialize the solution, using more physical values, espacially for turbulent variables. you can check up turbulent viscosity ratio after initialization, it should not be too large.

[arunintn]

Hi,
I have the same problem. The project is about super sonic flow over a surface. we have the Tu%= 0.1. the speed of M=1.4
the gauge pressure is = 771643.9

Errors :
when the solution initialized it shows:
turbulent viscous ratio limited in some cells
absolute pressure limited
temperature limited

can some one suggest me the solution.

[Abhya]

pastarox try :
solution controls -> advanced -> set cycle type to F cycle
.. Giving non physical source terms / boundary conditions may also cause it .. i had the same a coupe of times

[arunintn]

Abhya, Can you explain what is non physical scource tearm. The changed cycle type is F-cycle but not working.

Now i'm getting absolute pressure limited..

can some one direct me or tell me why i have the problem.
I checked my grid it look good too..

[Abhya]

Originally Posted by arunintn

Abhya, Can you explain what is non physical scource tearm. The changed cycle type is F-cycle but not working.

Now i'm getting absolute pressure limited..

can some one direct me or tell me why i have the problem.
I checked my grid it look good too..

unrealistic values ..
For example : I had a mass source term and an energy source term which depends on the mass source term as:
Energy source= (-mass source)*latent heat
I had forgotten the -ve sign earlier and this resulted in the error as yours...

[msm6166]

I m also new to CFD when i do the compute solution the it always shows divergence detected error.
i m using following boundary conditions:
1) velocity inlet with velocity 50.37m/s and temperature 303k
2) pressure outlet with atm. pressure
3) energy equation on
4) constant heat flux on wall 1400W/m2

[davoudj]

hello friends
I getting this error:
# Divergence detected in AMG solver: temperature -> Increasing relaxation sweeps!
I check mesh and because of pressure-base solution I cant change relaxation factor and also change solution control but it didn't work
please help me