[Paraview] Surface LIC Problem

[Magician]

Hi Burlen, Richard, Utkarsh,


Thanks for your advices.

I misunderstood that the Surface LIC Plugin should calculate
some kinds of the vector fields on surfaces.
My models are generated by NS solvers, so the surfaces have
non-zero vectors without slipping or moving wall.

For example, can I calculate surface friction vectors with ParaView?
I have flow fields and other physical constants.


# Extracting issue was solved by using Extract Subset filter.
# My meshes were structured grids of turbomachinery in this time,
# so all the walls can be extracted by the ijk coordinates.


Magician


On Feb 10, 2014, at 23:42, paraview-request at paraview.org wrote:

> Message: 5
> Date: Mon, 10 Feb 2014 09:42:27 -0500
> From: Utkarsh Ayachit <utkarsh.ayachit at kitware.com>
> To: Richard Grenon <richard.grenon at onera.fr>
> Cc: Magician <f_magician at mac.com>, ParaView <paraview at paraview.org>
> Subject: Re: [Paraview] Surface LIC Problem
> Message-ID:
> 	<CADHSJjAZ3YS240zkyPRFfacg8HyMO6Wr6Q0hqubpuXHL0WyLyg at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
> 
> You could also either use "Extract Block" to remove blocks on which
> you don't want to render LIC and then do LIC on the rest. There are
> others ways for this subsetting too, based on the nature of your data:
> e.g. you could your Extract Selection or Threshold to remove the cells
> that you don't want to render LIC on and then render the result.
> 
> On Mon, Feb 10, 2014 at 3:57 AM, Richard Grenon <richard.grenon at onera.fr> wrote:
>> Hello
>> 
>> Which vector field are you using with LIC ?
>> 
>> The LIC control panel allows to choose the vector to be used, and you 
>> MUST choose a vector field that is NOT ZERO on the surface.
>> 
>> With Euler CFD results, the velocity vector is not zero at the wall, and 
>> you can use this vector.
>> 
>> With Navier-Stokes CFD results, the velocity vector is zero at the wall, 
>> and you have to use the skin friction vector instead.
>> 
>> Richard
>> 
>>> On Feb 9, 2014, at 10:09, Burlen Loring <burlen.loring at gmail.com> wrote:
>>> 
>>> I'm not 100% sure I understand the situation. A picture or sample dataset would help. Is it that some of the surfaces don't have the velocity field defined on them?
>>> 
>>> Burlen
>>> 
>>> On 02/08/2014 04:42 AM, Magician wrote:
>>>> I'm trying the Surface LIC Plugin.
>>>> My models are formatted as VTK MultiBlock Dataset, and there are geometries
>>>> of fluids and walls.
>>>> I'd like to visualize LIC on the walls.
>>>> 
>>>> First I applied Surface LIC to the walls, the results are something wrong.
>>>> Next to the fluids, they are OK.
>>>> But there are extra walls which I don't want to visualize (ex. Inlets/Outlets, external boundaries).
>>>> Maybe the reason of the walls are that they don't have the velocity values of main flows.
>>>> 
>>>> I also tried the Resample with Dataset filter for linking main flows to the walls.
>>>> The results are roughly good, but sometimes the resampling qualitys are poor (dropping the values).
>>>> 
>>>> 
>>>> Is there a good way to visualize the part of the walls' LIC?
>>>> My sources have complicated shapes, so I want to make the best use of the information of blocks of walls.
>>>> 
>>>> 
>>>> Magician
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