[Paraview] Fluid Flow Simulation in ParaView

[Armin Wehrfritz]

Hi Rohit,

I had a look at your data file and I don't understand where your problem 
is. I can visualize the X and Y component of velocity and get seemingly 
correct results (i.e. X and Y have negative and positive values). The 
magnitude of the velocity vector is as expected everywhere positive.

Also the Glyph filter produces reasonable results with the default 
settings (e.g. the arrows can be colored by X or Y component with 
positive and negative values or by magnitude with only positive values).

So my question would be: What exactly do you want to visualize?

-Armin












On 04/06/2015 03:29 PM, Rohit Narurkar wrote:
> Hello!
>
> I tried applying the "Glyph" filter, but still the negative values
> aren't being considered. It considers only the magnitude.
>
> Can somebody please explain in detail how I should go about this? Please
> have a look at the .vtk file I have attached above, I am stuck at this
> point.
>
> Thank you
>
> On Thu, Mar 19, 2015 at 9:13 PM, Samuel Key <samuelkey at bresnan.net
> <mailto:samuelkey at bresnan.net>> wrote:
>
>     Rohit,
>
>     Assuming that the x-component of VecVelocity has negative values,
>     then from the selection [Magnitude|x|y|z] pick x and then only
>     VecVelocity_x will be displayed.
>
>     On the other hand, if "vector plots" are your goal, use PV's Glyph
>     filter.
>
>     Sam
>
>
>     On 3/19/2015 5:49 AM, Rohit Narurkar wrote:
>>     Is there no simple feature or option that considers negative
>>     values as well?
>>
>>     On Wed, Mar 18, 2015 at 5:50 PM, Utkarsh Ayachit
>>     <utkarsh.ayachit at kitware.com <mailto:utkarsh.ayachit at kitware.com>>
>>     wrote:
>>
>>         Try applying the "Glyph" filter or using the "Surface LIC"
>>         plugin[1]
>>
>>         [1]
>>         http://www.paraview.org/Wiki/ParaView/Line_Integral_Convolution
>>
>>         Utkarsh
>>
>>         On Tue, Mar 17, 2015 at 8:37 AM, Rohit Narurkar
>>         <rohitnarurkar at gmail.com <mailto:rohitnarurkar at gmail.com>> wrote:
>>         > Hello
>>         >
>>         > I wish to simulate fluid flow using ParaView. I have 1000
>>         .vtk files for the
>>         > 1000 time steps.
>>         > I have attached along with this mail one of the .vtk files.
>>         When I open this
>>         > collection in ParaView, and change the 'coloring' to the
>>         velocity name I
>>         > have given i.e. "VecVelocity" as you can see in the sample
>>         .vtk file. There
>>         > is another option to its right which offers 'magnitude',
>>         'x', 'y' and 'z'.
>>         > But there are some points with negative velocities and
>>         ParaView is only
>>         > considering the magnitude (hence positive). I wish to
>>         display even the
>>         > negative values. How do I do that?
>>         >
>>         > Any help would be great!
>>         >
>>         > Thank you!
>>         >
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