[kolahefereshte]

I changed propeller then The amount of force increases and time step
Decrease.
what is the problem?
(pimpledymfoam)

Thanks in advance!



amir

[kolahefereshte]

what is it?????!!!!!


FOAM FATAL ERROR:
problem. fineFacei:773375 rmUpperAddr:95750 rmLowerAddr:95800 coarseFacei:475991 cOwn:95749 cNei:101113

[kolahefereshte]

Hi everyone,
I run pimpleDyMFoam on the propeller.

my problem: forces is changing a lot!!!!


sum of forces:
pressure : (-517.436 53.6559 127.746)
viscous : (1.77798 -1.50944e-05 -0.110839)
porous : (0 0 0)
sum of moments:
pressure : (17.4725 20.9064 36.9176)
viscous : (0.319184 0.0019686 0.00749538)
porous : (0 0 0)
*************************************then*********
sum of forces:
pressure : (-1063.02 -52.2147 -154.645)
viscous : (1.68729 -0.0743521 -0.111804)
porous : (0 0 0)
sum of moments:
pressure : (40.1869 -21.4997 -45.6158)
viscous : (0.321284 -0.00163251 -0.00125835)
porous : (0 0 0)
after 0.8 s converge!!

Where can the problem be?



Best regards,Amir.

[wyldckat]

Quick answer: I came looking for posts you've made, after receiving the private message you sent me.

In that PM you gave this error code:

FOAM FATAL ERROR: 
problem. fineFacei:1249261 rmUpperAddr:201918 rmLowerAddr:196483 coarseFacei:776771 cOwn:196483 cNei:201916

    From function GAMGAgglomeration::agglomerateLduAddressing(..)
    in file matrices/lduMatrix/solvers/GAMG/GAMGAgglomerations/GAMGAgglomeration/GAMGAgglomerateLduAddressing.C at line 235.

I need the complete output of the error message. With just this limited information, it seems to indicate that GAMG is being used incorrectly.


As for the different values of forces, if you changed the propeller geometry, then it's only natural that it works differently.

You need to look at the pressure fields and velocity fields and see for yourself what is happening on both cases.

[kolahefereshte]

hi Bruno.
thank you for reply.
*yes I changed the propeller geometry and Change the direction of the face propeller.
you mean force's (very big) Fluctuate is normal?

I guess my pressure fields and velocity field are Runge.

what should I do?

solidBodyMotionFunctions::rotatingMotion::transfor mation(): Time = 0.00957262 transformation: ((0 0 0) (0.730372 (-0.683049 0 0)))
AMI: Creating addressing and weights between 5984 source faces and 5676 target faces
AMI: Patch source sum(weights) min/max/average = 0.982639, 1.07129, 1.00011
AMI: Patch target sum(weights) min/max/average = 0.954482, 1.11492, 1.00021
PIMPLE: iteration 1
smoothSolver: Solving for Ux, Initial residual = 2.87215e-05, Final residual = 3.83925e-07, No Iterations 2
smoothSolver: Solving for Uy, Initial residual = 0.00521045, Final residual = 1.6072e-07, No Iterations 5
smoothSolver: Solving for Uz, Initial residual = 0.0040226, Final residual = 8.4076e-07, No Iterations 4


--> FOAM FATAL ERROR:
problem. fineFacei:494861 rmUpperAddr:190038 rmLowerAddr:73651 coarseFacei:425481 cOwn:73716 cNei:190038

From function GAMGAgglomeration::agglomerateLduAddressing(..)
in file matrices/lduMatrix/solvers/GAMG/GAMGAgglomerations/GAMGAgglomeration/GAMGAgglomerateLduAddressing.C at line 235.

FOAM exiting
thank you ...

[sajjjad]

hi
check your ami cylinder.I think that is problem.meybe surface mesh not good or that is not accurate(short).
Best regards

[kolahefereshte]

hi sajjad
you are right. cylinder geometry Had a problem.
I apologize for all
thanx