[Paraview] calculator tensor field

[Utkarsh Ayachit]

Can you attach a sample data file/state file? That'll make it easier
to identify the problem and suggest a solution.

Thanks
Utkarsh

On Sat, Oct 4, 2014 at 4:14 AM,  <Marschmann at stud.uni-heidelberg.de> wrote:
> Hello everyone,
>
> I have three displacement field vector components u, v, w in my .vtk file
> and wish to display the associated stress tensor.
> I made the following steps:
>
> - Apply the filter Gradient Of Unstructued DataSet
> -> Now have 9 scalars Gradient_0, ... , Gradient 8
>
> - compute components of stress tensor via sigma_ij = div(Gradient) + u_i,j
> -> Now have additional 9 scalars sigma_ij
>
> - from this form traction vectors:
> T_i = sigma_ij e_j   ,where e_j are the unit vectors iHat
>
> -> Now have three traction vectors from which the tensor field computation
> doesnt work:
>
> - I do Result = T_1*iHat + T_2*jHat + T_3*kHat for the tensor calculation
> and get the following error message:
>
> ERROR: In
> /home/abuild/rpmbuild/BUILD/ParaView-v4.0.1-source/VTK/Common/Misc/vtkFunctionParser.cxx,
> line 201
> vtkFunctionParser (0x205ddac0): Parse: Error deciding between ambiguous
> operators
>
>
> ERROR: In
> /home/abuild/rpmbuild/BUILD/ParaView-v4.0.1-source/VTK/Common/Misc/vtkFunctionParser.cxx,
> line 300
> vtkFunctionParser (0x205ddac0): expecting either 2 scalars or a scalar and a
> vector
>
>
> ERROR: In
> /home/abuild/rpmbuild/BUILD/ParaView-v4.0.1-source/VTK/Common/Misc/vtkFunctionParser.cxx,
> line 201
> vtkFunctionParser (0x205ddac0): Parse: Error deciding between ambiguous
> operators
>
>
> - Can you help me or tell me gow to visualize the stress tensor from the
> displacement field?
> - Alternatively you it would also be good to know how to multiply the result
> of  filter Gradient of Unstructured DataSet by a scalar value.
>
>
> Many thanks for helping!
> Gianna
>
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