fvTensorMatrix equation solving ?

T.D. · April 7, 2011, 07:28

HI,
i have a tensorial equation to be solved for the tensor Y:

fvTensorMatrix YEqn

when i run the solver i see that:
smoothSolver: Solving for Yxx, Initial residual = 0.875064, Final residual = 1.60516e+149, No Iterations 1000
smoothSolver: Solving for Yxy, Initial residual = 0.686555, Final residual = 8.05809e+148, No Iterations 1000
smoothSolver: Solving for Yyx, Initial residual = 0.686555, Final residual = 8.05809e+148, No Iterations 1000
smoothSolver: Solving for Yyy, Initial residual = 0.872595, Final residual = 1.59013e+149, No Iterations 1000
smoothSolver: Solving for Yzz, Initial residual = 0.873874, Final residual = 1.60776e+149, No Iterations 1000

my question is, why Yyx is solved however it is symmetrical, and Yxz is never solved?

however In my defintion for Y, i defined it as a total general matrix volTensorField Y.
Is it the problem in the fvTensorMatrix Equation ? can it solves a tensorial equation for a general tensor Y? or only for symmetrical defined tensors?
any ideas ?

thanks,

T.D.

hjasak · April 9, 2011, 10:09

Looks like your mesh is 2-D or the missing components are uniform.

Hrv

T.D. · April 10, 2011, 16:59

hi thanks a lot prof. hjasak, i solved the problem, it was inside the choice of the solvers' settings in addition to the relaxation-factors.

thanks a lot

hope to meet soon at the 6th OpenFOAM Workshop in PENNSTATE
sincerely yours,
T.D.

April 7, 2011, 07:28	fvTensorMatrix equation solving ?	#1
T.D. Senior Member Join Date: Sep 2010 Posts: 226 Rep Power: 17	HI, i have a tensorial equation to be solved for the tensor Y: fvTensorMatrix YEqn when i run the solver i see that: smoothSolver: Solving for Yxx, Initial residual = 0.875064, Final residual = 1.60516e+149, No Iterations 1000 smoothSolver: Solving for Yxy, Initial residual = 0.686555, Final residual = 8.05809e+148, No Iterations 1000 smoothSolver: Solving for Yyx, Initial residual = 0.686555, Final residual = 8.05809e+148, No Iterations 1000 smoothSolver: Solving for Yyy, Initial residual = 0.872595, Final residual = 1.59013e+149, No Iterations 1000 smoothSolver: Solving for Yzz, Initial residual = 0.873874, Final residual = 1.60776e+149, No Iterations 1000 my question is, why Yyx is solved however it is symmetrical, and Yxz is never solved? however In my defintion for Y, i defined it as a total general matrix volTensorField Y. Is it the problem in the fvTensorMatrix Equation ? can it solves a tensorial equation for a general tensor Y? or only for symmetrical defined tensors? any ideas ? thanks, T.D.

April 9, 2011, 10:09		#2
hjasak Senior Member Hrvoje Jasak Join Date: Mar 2009 Location: London, England Posts: 1,907 Rep Power: 33	Looks like your mesh is 2-D or the missing components are uniform. Hrv __________________ Hrvoje Jasak Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk

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April 10, 2011, 16:59		#3
T.D. Senior Member Join Date: Sep 2010 Posts: 226 Rep Power: 17	hi thanks a lot prof. hjasak, i solved the problem, it was inside the choice of the solvers' settings in addition to the relaxation-factors. thanks a lot hope to meet soon at the 6th OpenFOAM Workshop in PENNSTATE sincerely yours, T.D.