CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > CFX

Interpolation (Number of mapped nodes)

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 2, 2008, 19:51
Default Interpolation (Number of mapped nodes)
  #1
Sam
Guest
 
Posts: n/a
Hi,

I use the solution obtained from a coarse mesh, as an initial condition file for the fine mesh simulation.

Coarse mesh : Nodes = 28315 , Elements = 96546 (tet=67228, wedges=28592, pyramids=726)

Fine mesh : Nodes = 50577 , Elements = 176159 (tet=124958, prisms=50912, pyramids=889)

But the interpolation output shows that

Number of Mapped Nodes = 46295 ( 91.5%)

Number of Unmapped Nodes = 4282 ( 8.5%)

I am not able to understand how come 46295 nodes could be mapped as the the initial value file itself has only 28315 nodes.

Please throw some light on it.

Thanks a lot,

Sam

  Reply With Quote

Old   January 2, 2008, 23:10
Default Re: Interpolation (Number of mapped nodes)
  #2
opaque
Guest
 
Posts: n/a
Dear Sam,

The interpolator maps the nodes on the fine mesh into the coarse mesh. Otherwise, how could you interpolate the coarse mesh values into the fine mesh?

The mapped (46295) plus the unmapped (4282) adds up to 50577. That is the number of nodes in the fine mesh.

Hope it helps,

Opaque33
  Reply With Quote

Old   January 2, 2008, 23:16
Default Re: Interpolation (Number of mapped nodes)
  #3
Sam
Guest
 
Posts: n/a
Hi,

Thank you very much for your reply.

I am under the impression that solution values (velocities, pressure etc) from a initial value file are interpolated to the definition file mesh in order to start the simulation. If that is correct (please correct me if it was wrong), and assume that the initial values file has coarse mesh and the definition file has fine mesh, then results would have been getting interpolated from the coarse mesh to the fine mesh.

I know somewhere I am overlooking the concept. It would be great if you can further help me with it.

And happy new year

-Sam

  Reply With Quote

Old   January 6, 2008, 20:51
Default Re: Interpolation (Number of mapped nodes)
  #4
CycLone
Guest
 
Posts: n/a
Hi Sam,

What the solver is telling you is how many nodes were mapped to other nodes. Nodes in the fine mesh will get mapped to nodes in the coarse mesh in order to receive the values (or vice versa).

The file (.def or .res) chosen as the run definition file will receive values from the source .res file. Note that if the run definition file had existing results (i.e. was a .res file), the solver will also write the differences between the source and target values. This can be used for file comparison (although be careful to back up the res file before interpolating onto it).

-CycLone
  Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
[ICEM] Number of Nodes gi12 ANSYS Meshing & Geometry 7 November 16, 2011 07:01
Number of nodes sidzishere CFX 2 March 21, 2011 16:21
DecomposePar unequal number of shared faces maka OpenFOAM Pre-Processing 6 August 12, 2010 10:01
[blockMesh] BlockMeshmergePatchPairs hjasak OpenFOAM Meshing & Mesh Conversion 11 August 15, 2008 08:36
number of nodes anna CFX 2 December 15, 2006 11:29


All times are GMT -4. The time now is 02:26.