[General] Exporting Data With Paraview

ansys_matt · March 31, 2021, 13:47

I am transitioning from CFD-post for processing cfd data exported from Fluent. In post, I was able to export data for each node at each time step, but I am unable to figure out how to do this in ParaView.

So, say I had 3 time steps. I could export data in 3 csv files such that each file had X,Y, Z coordinate of the node, then the value I needed, say, velocity and density. At the end of the operation I was able to have:

E1.csv
E2.csv
E3.csv

Then I could load each file in matlab, extract the velocities and density (for example) at each node, do some math (calculate kinetic energy, for example) and plot the change as a function of time in matlab.

How do I do such a thing in ParaView? I would like to be able to export but it seems I would have to manually load each time step, export, then load the next time step etc. But I have 1400 time steps so this is impractical.

Thanks

ansys_matt · March 31, 2021, 17:11

As it turns out, someone else asked a similar question that was enjoying a resurgence right next to mine. So I think I have that part figured out. Let me ask a different but related question.

Is there a way to do this kind of processing in Paraview rather than exporting all these files and doing it in matlab?

For example, I want to calculate energy dissipation in a flow, given by this equation.

As it is now I export pressure, density, velocity at the node to calculate the integrand. Could this be done directly in Paraview? How?

March 31, 2021, 13:47	Exporting Data With Paraview	#1
ansys_matt Member Join Date: Feb 2013 Posts: 60 Rep Power: 13	I am transitioning from CFD-post for processing cfd data exported from Fluent. In post, I was able to export data for each node at each time step, but I am unable to figure out how to do this in ParaView. So, say I had 3 time steps. I could export data in 3 csv files such that each file had X,Y, Z coordinate of the node, then the value I needed, say, velocity and density. At the end of the operation I was able to have: E1.csv E2.csv E3.csv Then I could load each file in matlab, extract the velocities and density (for example) at each node, do some math (calculate kinetic energy, for example) and plot the change as a function of time in matlab. How do I do such a thing in ParaView? I would like to be able to export but it seems I would have to manually load each time step, export, then load the next time step etc. But I have 1400 time steps so this is impractical. Thanks

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March 31, 2021, 17:11		#2
ansys_matt Member Join Date: Feb 2013 Posts: 60 Rep Power: 13	As it turns out, someone else asked a similar question that was enjoying a resurgence right next to mine. So I think I have that part figured out. Let me ask a different but related question. Is there a way to do this kind of processing in Paraview rather than exporting all these files and doing it in matlab? For example, I want to calculate energy dissipation in a flow, given by this equation. As it is now I export pressure, density, velocity at the node to calculate the integrand. Could this be done directly in Paraview? How?