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momentum transport and mass transports coupled simulation using matlab script

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Hello All~

I conduct momentum transport and mass transports coupled simulation using matlab script~

but i have some problems~

when i simulated this topic, always failed to find a solutions~
====================================================
Warning:
Failed to find a solution:
No convergence, even when using the minimum damping factor.
Returned solution has not converged.
====================================================

[my script(geneal form formulation)] - momentum & mass transport (diffuction & convection)

fem.equ.ga={ { {'-p+2*eta*ux' 'eta*(uy+vx)'} {'eta*(uy+vx)' '(-p+2*eta*vy)'} {0 0} {'-D*cx-D*cy' '-D*cx-D*cy'} } };
fem.equ.f={ {'rho*(u*ux+v*uy)' 'rho*(u*vx+v*vy)' 'ux+vy' '-u*cx-v*cy'} };
fem.bnd.ind={[4] [1] [3] [2]}; % rectangular geometry inlet, wall, membrane wall, outlet
fem.bnd.r={ {'u+6*s*(1-s)*u0*nx' 'v+6*s*(1-s)*u0*ny' 0 '-c+c0'}...
{'u' 'v' 0 0} {'u' 'v-(deltap-fos*c)/Rm' 0 0} {0 0 'p' 0} };
fem.bnd.g={{0 0 0 0} {0 0 0 '-(-nx*u-ny*v)*c*rej'} {0 0 0 '-(-nx*u-ny*v)*c*rej'} {'nx*p' 'ny*p' 0 0}};

what is problems of my script or process?

thanks you~

1 Reply Last Post 21 ott 2012, 05:01 GMT-4
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Hello Oh Seungjae

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Posted: 1 decade ago 21 ott 2012, 05:01 GMT-4
Hi,seungjae

I'm having a similar issue with my model. I excecute the plane stress analysis using a mixed formulation coupled simulation using matlab script .

I think you have solve your problem. Can you give me some advices on how do you solve it ?It may be important for me to solve my own problems.

Thanks so much,

cunfu


Hi,seungjae I'm having a similar issue with my model. I excecute the plane stress analysis using a mixed formulation coupled simulation using matlab script . I think you have solve your problem. Can you give me some advices on how do you solve it ?It may be important for me to solve my own problems. Thanks so much, cunfu

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