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source term in near wall cell

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Old   September 26, 2013, 06:25
Default source term in near wall cell
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Hello foamers,

I need to add source terms specific only to the near wall cells. Can anyone suggest a way to do it?



regrads,

Raj
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Old   September 28, 2013, 09:05
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three hints:
1- if its on patch then you should modify your boundary condition or may using funkySetFields

2- if its in internalField, then you would want to modify your solver and using setField or funkySetFields to defines that region

3- you may want to try Swak4Foam

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Old   September 30, 2013, 09:29
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Quote:
Originally Posted by nimasam View Post
three hints:
1- if its on patch then you should modify your boundary condition or may using funkySetFields

2- if its in internalField, then you would want to modify your solver and using setField or funkySetFields to defines that region

3- you may want to try Swak4Foam

Best Regards

Thanks nimasam. Will try and then get in touch with you...


regards,
Raj
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Old   October 2, 2013, 04:53
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hello foamers:
I have a boundary condition which I need use groovy bc. I set it as:
Code:
    
type                groovyBC;
    gradientExpression  "gradT";
    variables           "gradT=h&k;";
    value               uniform 0;
    fractionExpression  "0";
After I run my solver,I got the following messages:
Code:
Starting time loop

Time = 0.002

Courant Number mean: 0 max: 0.018457 velocity magnitude: 1.0013
DILUPBiCG:  Solving for Ux, Initial residual = 1, Final residual = 3.34725e-08, No Iterations 2
DILUPBiCG:  Solving for Uy, Initial residual = 1, Final residual = 3.46171e-08, No Iterations 2
DILUPBiCG:  Solving for Uz, Initial residual = 1, Final residual = 5.18204e-08, No Iterations 2
DICPCG:  Solving for p, Initial residual = 1, Final residual = 9.56645e-07, No Iterations 456
time step continuity errors : sum local = 4.24956e-11, global = 1.10631e-13, cumulative = 1.10631e-13
DICPCG:  Solving for p, Initial residual = 0.0001707, Final residual = 9.46825e-07, No Iterations 266
time step continuity errors : sum local = 1.00183e-08, global = 3.48549e-12, cumulative = 3.59613e-12
DICPCG:  Solving for p, Initial residual = 1.53399e-06, Final residual = 9.69365e-07, No Iterations 213
time step continuity errors : sum local = 1.02131e-08, global = 1.92931e-10, cumulative = 1.96527e-10
[1] swak4Foam: Allocating new repository for sampledGlobalVariables
[12] swak4Foam: Allocating new repository for sampledGlobalVariables
[2] swak4Foam: Allocating new repository for sampledGlobalVariables
[7] swak4Foam: Allocating new repository for sampledGlobalVariables
[13] swak4Foam: Allocating new repository for sampledGlobalVariables
[15] swak4Foam: Allocating new repository for sampledGlobalVariables
[10] swak4Foam: Allocating new repository for sampledGlobalVariables
[4] swak4Foam: Allocating new repository for sampledGlobalVariables
[0] swak4Foam: Allocating new repository for sampledGlobalVariables
[9] swak4Foam: Allocating new repository for sampledGlobalVariables
[3] swak4Foam: Allocating new repository for sampledGlobalVariables
[5] swak4Foam: Allocating new repository for sampledGlobalVariables
[11] swak4Foam: Allocating new repository for sampledGlobalVariables
[14] swak4Foam: Allocating new repository for sampledGlobalVariables
[6] swak4Foam: Allocating new repository for sampledGlobalVariables
[8] swak4Foam: Allocating new repository for sampledGlobalVariables
what does this
Code:
swak4Foam: Allocating new repository for sampledGlobalVariables
mean?

Does it mean that the boundary condition is not "h&k"?

Thank you very much!

regards!

xiaof
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Old   October 8, 2013, 19:37
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Quote:
Originally Posted by xiaof View Post
hello foamers:
I have a boundary condition which I need use groovy bc. I set it as:
Code:
    
type                groovyBC;
    gradientExpression  "gradT";
    variables           "gradT=h&k;";
    value               uniform 0;
    fractionExpression  "0";
After I run my solver,I got the following messages:
Code:
Starting time loop

Time = 0.002

Courant Number mean: 0 max: 0.018457 velocity magnitude: 1.0013
DILUPBiCG:  Solving for Ux, Initial residual = 1, Final residual = 3.34725e-08, No Iterations 2
DILUPBiCG:  Solving for Uy, Initial residual = 1, Final residual = 3.46171e-08, No Iterations 2
DILUPBiCG:  Solving for Uz, Initial residual = 1, Final residual = 5.18204e-08, No Iterations 2
DICPCG:  Solving for p, Initial residual = 1, Final residual = 9.56645e-07, No Iterations 456
time step continuity errors : sum local = 4.24956e-11, global = 1.10631e-13, cumulative = 1.10631e-13
DICPCG:  Solving for p, Initial residual = 0.0001707, Final residual = 9.46825e-07, No Iterations 266
time step continuity errors : sum local = 1.00183e-08, global = 3.48549e-12, cumulative = 3.59613e-12
DICPCG:  Solving for p, Initial residual = 1.53399e-06, Final residual = 9.69365e-07, No Iterations 213
time step continuity errors : sum local = 1.02131e-08, global = 1.92931e-10, cumulative = 1.96527e-10
[1] swak4Foam: Allocating new repository for sampledGlobalVariables
[12] swak4Foam: Allocating new repository for sampledGlobalVariables
[2] swak4Foam: Allocating new repository for sampledGlobalVariables
[7] swak4Foam: Allocating new repository for sampledGlobalVariables
[13] swak4Foam: Allocating new repository for sampledGlobalVariables
[15] swak4Foam: Allocating new repository for sampledGlobalVariables
[10] swak4Foam: Allocating new repository for sampledGlobalVariables
[4] swak4Foam: Allocating new repository for sampledGlobalVariables
[0] swak4Foam: Allocating new repository for sampledGlobalVariables
[9] swak4Foam: Allocating new repository for sampledGlobalVariables
[3] swak4Foam: Allocating new repository for sampledGlobalVariables
[5] swak4Foam: Allocating new repository for sampledGlobalVariables
[11] swak4Foam: Allocating new repository for sampledGlobalVariables
[14] swak4Foam: Allocating new repository for sampledGlobalVariables
[6] swak4Foam: Allocating new repository for sampledGlobalVariables
[8] swak4Foam: Allocating new repository for sampledGlobalVariables
what does this
Code:
swak4Foam: Allocating new repository for sampledGlobalVariables
mean?

Does it mean that the boundary condition is not "h&k"?
No. This is just an informative output. Ignore it
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Old   February 1, 2016, 11:31
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Xinguang Wang
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Hi

I meet the same situation that a source term is needed in the momentum equation only near the wall cell centres. Have you find a how to add such a source term?

Xinguang
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