[Paraview] [EXTERNAL] Re: Rotational velocities

[Scott, W Alan]

From my user:

Alan,

I am not sure I have a good answer. Let’s say we have a block of elements moving through space that represent some component. That component is translating and rotating as a rigid body (or flexible/deformable body). I want to be able to calculate in paraview the rigid body translation and rotation of the body based on the nodal displacement or coordinate information. The nodes only include translation information since they are from hexahedral elements. I am not aware of the algorithm for performing that calculation, but I am pretty sure one exists for a rigid body (maybe even for a deformable body as well – although in the latter case, I would guess the algorithm is not exact). Digital image correlation techniques come to mind. The DIC people perform these calculations all the time somehow. Anyway, that is what I want to be able to do. Say something like “calculate motion of block 100” and plot the six degree of freedom translation and rotations versus time. And then save the information to an ASCII file for plotting in an external program, such as excel.

John

From: Berk Geveci [mailto:berk.geveci at kitware.com]
Sent: Tuesday, July 08, 2014 5:10 PM
To: Scott, W Alan
Cc: paraview at paraview.org
Subject: [EXTERNAL] Re: [Paraview] Rotational velocities

It would be good to have some more clear mathematical definition of (2). I am assuming it involves some sort of integration but it is not clear.

On Tue, Jul 8, 2014 at 5:45 PM, Scott, W Alan <wascott at sandia.gov<mailto:wascott at sandia.gov>> wrote:
Two questions from a user.  I don’t yet know if the user is using ParaView remote server.  I know that we have number 1) being implemented, but is there any other way to do it?  Any ideas on 2)?

Thanks,

Alan



1)      I want to calculate the average nodal velocity for nodes in a particular element block. How do I do that? The documentation for paraview discussing how one might do that is very confusing and not all that helpful.



2)      I want to calculate the rotational velocities of a component (block of elements) in paraview using the nodal translational velocities. How do I do that?


Thanks for your help.



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