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Forum: Fluent UDF and Scheme Programming

August 21, 2014, 07:48

Replies: 25

strain rate magnitude

Views: 35,599

Posted By Amir

Hi, You need to put the Message command inside...

Hi,
You need to put the Message command inside your loop, not out of that!
Moreover, this is "\n" not "/n".

Bests,

Forum: Fluent UDF and Scheme Programming

August 19, 2014, 10:40

Replies: 25

strain rate magnitude

Views: 35,599

Posted By Amir

I guess, proper definition of the Og tensor as...

I guess, proper definition of the Og tensor as Og[ND_ND][ND_ND] and an initialization of this tensor may fixed this issue! However, I wonder how your UDF may lead to such error during the...

Forum: Fluent UDF and Scheme Programming

August 18, 2014, 08:33

Replies: 25

strain rate magnitude

Views: 35,599

Posted By Amir

Hi, No, this is quite straight-forward! Just...

Hi,

No, this is quite straight-forward! Just substitute the S_mm term with sum of the diagonal components.
i.e., S_mm=S11+S22+S33

kronecker_delta_ij=0, where i/=j
kronecker_delta_ij=1, where...

Forum: Fluent UDF and Scheme Programming

September 20, 2012, 10:44

Replies: 25

strain rate magnitude

Views: 35,599

Posted By Amir

Yes I've seen that. What I said was the...

Yes I've seen that.
What I said was the definition in continuum mechanics but in FLUENT some definitions have changed! e.g., wall shear stress is wall traction!

Bests,

Forum: Fluent UDF and Scheme Programming

September 20, 2012, 10:26

Replies: 25

strain rate magnitude

Views: 35,599

Posted By Amir

Dear friend, These are two different...

Dear friend,

These are two different concepts. Strain rate contains both shear and normal rates; you can consider strain rate as rate of deformation where the shear rate is just one part of that....

Forum: Fluent UDF and Scheme Programming

July 23, 2011, 04:43

Replies: 25

strain rate magnitude

Views: 35,599

Posted By Amir

Dear Rakesh, In Mathematics, the magnitude of a...

Dear Rakesh,
In Mathematics, the magnitude of a second order tensor is defined as \sqrt{T:T}, but here, as you said, we have a convention for shear strain magnitude in which an extra constant...

Forum: Fluent UDF and Scheme Programming

July 21, 2011, 15:42

Replies: 25

strain rate magnitude

Views: 35,599

Posted By Amir

Hi, the compact form is: \sqrt{2*D:D} which...

Hi,
the compact form is:
\sqrt{2*D:D}
which is:
\sqrt{2*DijDij} ; i,j=1,2,3 (two inner products)
D : strain rate tensor

Showing results 1 to 7 of 7

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