[General] paraview derivatives

Antoniorp · September 7, 2015, 06:24

Hello everyone,

I need to calculate the derivatives of velocity dui/dxj and duj/dxi on the middle of a wave flume, so i can calculate the Reynolds stresses.

Can i do it using paraview? If so, could someone explain me how to do it or point me to some papers explaining the subject..

Thanks!

António

Antoniorp · September 14, 2015, 13:03

Anyone knows something about this?

To calculate the Reynolds stresses im going to use this equation:

-ui'uj'=2vtSij-2/3*k*deltaij

with Sij=1/2*(deltaU/deltaxj+deltaUj/deltaxi)

So the only thing i need is this velocity derivatives, can i do it in paraview?

Thanks!

Flowkersma · September 15, 2015, 02:25

Hi António,

There is "Gradient Of Unstructured DataSet" filter which does exactly what you want. For velocity vector it calculates 9 component tensor (dU/dx, dU/dy, dU/dz, dV/dx, dV/dy, dV/dz,dW/dx, dW/dy, dW/dz).

-Mikko

Antoniorp · September 15, 2015, 06:52

Hi Mikko

Thanks a lot for your answer!

I will surely use it.

Antonio

September 7, 2015, 06:24	paraview derivatives	#1
Antoniorp Member António Pires Join Date: Oct 2014 Posts: 33 Rep Power: 12	Hello everyone, I need to calculate the derivatives of velocity dui/dxj and duj/dxi on the middle of a wave flume, so i can calculate the Reynolds stresses. Can i do it using paraview? If so, could someone explain me how to do it or point me to some papers explaining the subject.. Thanks! António

September 15, 2015, 02:25		#3
Flowkersma Senior Member Mikko Join Date: Jul 2014 Location: The Hague, The Netherlands Posts: 243 Rep Power: 13	Hi António, There is "Gradient Of Unstructured DataSet" filter which does exactly what you want. For velocity vector it calculates 9 component tensor (dU/dx, dU/dy, dU/dz, dV/dx, dV/dy, dV/dz,dW/dx, dW/dy, dW/dz). -Mikko wyldckat, shashanktiwari619 and AnthonyP like this.

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September 14, 2015, 13:03		#2
Antoniorp Member António Pires Join Date: Oct 2014 Posts: 33 Rep Power: 12	Anyone knows something about this? To calculate the Reynolds stresses im going to use this equation: -ui'uj'=2vtSij-2/3kdeltaij with Sij=1/2*(deltaU/deltaxj+deltaUj/deltaxi) So the only thing i need is this velocity derivatives, can i do it in paraview? Thanks!

September 15, 2015, 06:52		#4
Antoniorp Member António Pires Join Date: Oct 2014 Posts: 33 Rep Power: 12	Hi Mikko Thanks a lot for your answer! I will surely use it. Antonio