pressure iteration didnt converge
 

how can I edit this error? what is that mean?

Solver Messages: pressure iteration did not converge in itmax= 100 iterations
at time= 1.03537E-02 cycle= 90 iter= 100 nocon= 0
epsi= 4.083E-01 maximum residual= 5.539E-01 at i= 124 j= 2 k= 70 block= 5
convective flux exceeded stability limit
at t= 3.2759E-02 cycle= 306 iter= 5 delt= 3.4220E-05 mesh block 5
restarting cycle with smaller time step
maximum failure ratio = 2.95606E+00 is in z-coordinate direction
at cell ( 233, 2, 215) mesh block 5

Dear Melek
The solver, solve 100 times an iteration, if the stop criteria accepted then go to next iteration, but if it unaccepted so stop the solving. So, no way to get the accurate simulation results.

Regards,
M. R. sharifabadi

Thank you Sharifabadi. so do you have any idea how can I correct the mistake... I tried to increase GMPRES number and decrease messh sell sizes. However the simulation runned with 2 gb and again took this message. pressure iteration didnt converse itmax =100

As far as I know, there is no way to take away from this problems, restart your simulation from first ( call STL files ) and do simulation again may you haven't problem.

Don't hesitate if you have any question.
this is my email address: mo.sharifabadi@gmail.com

Have you corrected you problem? i am stuck in such a situaiton too

Do you have different mesh blocks in your model ?

It can be due to connection problems between mesh blocks (or bad cell size ratio).

I didn't add any mesh plane to the mesh block,just let mesh generator do the job.

If you have thin thickness, it could be interesting to add mesh planes.

Usually, a list of messages as your comes from bad mesh conditions. When you analyze results, geometry visualization is good ?

Thank you for answers, mesh and geo was crossed I thınk but only I wrote relaxatıon factor = 0,5 and downed tıme step all problems are over

And mesh was strong I thınk chanced mesh desıgn

n
 

thank you for answers

Hey melek ...can u please tell me in detail what exactly did u do to overcome that problem..because i am facing the same problem for days now? Please help..

Hi Nauman,

Could you find the solution?

Thanks,
Yasemin

Also, try using a much smaller initial time-step.

Yes Yasmin, all i needed to do was create two mesh blocks seperately for the geometry and the bigger domain.. and also need to take care that the boundaries of the smaller mesh block cells coincide with the boundaries of the bigger mesh block cells...

Thank you!

Cfd
 

You are welcome