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Help on UDF: access to wall shear stress

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Old   May 20, 2004, 00:21
Default Help on UDF: access to wall shear stress
Zhihua Li
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I am doing an unsteady simulation. I wish to report the time averaged pressure coefficient and friction coefficient around a cylinder. I am considering using UDF to store the local pressure values at each time step and take an average on time at the end of my simulation.

Can anybody tell me how to store an array of data at each time step and read it out later? I am also wondering if anybody knows how to access the wall shear stress and heat transfer coefficient in UDF.

Thank you very much and I appreciate your help!

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Old   May 21, 2004, 22:29
Default Re: Help on UDF: access to wall shear stress
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include storage.h header file

define real wallshear[ND_ND];

face = face variable ;

tf= face thread

NV_V (wallshear, =, C_STORAGE_R_NV(face,tf,SV_WALL_SHEAR));

this will give you the wall_shear_force multiplying by the area vector would give you the wall_shear_stress.

Hope this helps ,


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Old   May 26, 2004, 11:55
Default Re: Help on UDF: access to wall shear stress
Zhihua Li
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Thank you very much, Ajay!
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