Issues with the vector display

ParaView Support
1

Hello there,

I use paraview in combination with openFOAM and I am a total noob in both. I tried to run the first tutorial in openFOAM, but I have some problems with vector rendering there.

  1. The only vector I have in my data is U, however when I use the glyph filter I can only select the scalar p. U does not show up in the selection in the toolbar.
  2. someone gave me the tip to create my vector with the calculater using the formula sqrt(U_X^2+U_Y^2+U_Z^2), but when I enter this into the calculator, I get the following error message:

Syntax error: expecting a variable name; see position 5ERROR: In /build/paraview-vlxewD/paraview-5.7.0/VTK/Common/Misc/vtkFunctionParser.cxx, line 1243
vtkFunctionParser (0x557c75c73230): Syntax error: expecting a variable name; see position 5

An error occurred when parsing the calculator’s function. See previous errors.Warning: In /build/paraview-vlxewD/paraview-5.7.0/VTK/Filters/Core/vtkArrayCalculator.cxx, line 363
vtkPVArrayCalculator (0x557c750e7490): An error occurred when parsing the calculator’s function. See previous errors.

So, now I don’t know where it expects a variable and what variable name it should give.

I hope someone can help me to generate the velocity vector for the right vector representation.

2

please share your data

3

I’m not completely sure how you mean that. After the calculation in OpenFOAM, I have 5 directories for 5 time steps, each with the files p, phi and U in them. In the file for U, for example, the data after the OpenFOAM header is as follows:

dimensions [0 1 -1 0 0 0 0];

internalField nonuniform List
400
(
(0.000249136 -0.000245641 0)
(0.000137297 0.000111667 0)
(-0.00116243 0.000558043 0)
(-0.00343171 0.000872759 0)
(-0.00628217 0.00103011 0)
(-0.00932353 0.00104524 0)
(-0.012208 0.000942603 0)
(-0.0146482 0.000748202 0)
(-0.0164225 0.000486721 0)
(-0.0173758 0.000181792 0)
(-0.0174205 -0.000142538 0)
(-0.0165407 -0.000460362 0)
(-0.0147979 -0.000742949 0)
(-0.0123365 -0.000958733 0)
(-0.00938798 -0.00107452 0)
(-0.00626732 -0.00105852 0)
(-0.00335775 -0.000886232 0)

Is that what you meant?

4

What I mean is to zip your OpenFOAM directory and share the archive using wetransfer or similar.

5

Ah ok, I hope it works like this now. Under the following link is the OpenFOAM directory where I had tried it:

6

I have no problem selecting the U vector as the orientation array:

a
a1520×905 100 KB

7

This is the same output I get, but it does not represent the velocity distribution.
I should actually see in the top bar, where with me only solid color, p , vtk compositionindex,… I should also be able to select a U.

Error
Error1202×803 131 KB

The correct output should actually look like this:

RightOutput
RightOutput564×525 131 KB

8

Which version of ParaView are you using ? I think this issue has been fixed already.

9

My paraview version is 5.7.0, which was the one I got by sudo apt-get install paraview. Which version would I need?

10

I’d recommend 5.9.0, You can download it here: https://www.paraview.org/download/

11

Thank you, I will try it.