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strain rate magnitude

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Old   September 1, 2014, 06:45
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  #21
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Hi,
I am using tensors in udf so my question is:
should I initialize the tensors?or there is no need for it?
for example
PHP Code:
 for(j=0;j<ND_ND;j++)
{
for(
i=0;i<ND_ND;i++)
{
  
S12[i][j]=0.0;
}
}
and 
then 
for(j=0;j<ND_ND;j++)
{
for(
i=0;i<ND_ND;i++)
{
  
S12[i][j]=....calculate;
}

is it ok?
thanks in advance!
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Old   November 19, 2014, 10:01
Default vorticity vs strain rate
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Qureshi M Z I
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hi, anybody know the difference in equation of vorticity and strain rate in CFD fluent. i want to write the UDF of vorticity in 3D.
if anybody know about this, please share this .
thanks
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Old   July 10, 2018, 08:12
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  #23
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Prasanna Welahettige
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Hi,
I know this conversation is very old, but the information here is very important.

I would like to know, shear stress for the incomprehensible fluid is given as following equation, by just removing the linear expansion terms?

s=\sqrt{(u_{z}+w_{x})^{2}+(u_{y}+v_{x})^{2}+(w_{y}+v_{z})^{2}}

Is it correct ?
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Old   July 17, 2018, 03:51
Post Gradient of strain rate
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Arash Mahboubidoust
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Hi friends,
How can I write gradient of strain rate (∇γ ̇) in udf?
Can anyone help me?
Thanks,
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Old   February 9, 2021, 09:07
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Hi, thanks for this Does anyone has a good reference for the derivation? Thanks!
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