How to extract surface from plot3d grid (NASA chimera mesh)

kedarerohan · December 8, 2011, 02:11

Hi,
Can anybody tell me how to extract surface from plot3d mesh. Insist me some software that reads plot3d format grid.
I have taken mesh from nasa website of space shuttle launch vehicle. Its an chimera grid in plot3d format. This mesh doesnot open in Ansys ICEM. What is the reason. If not can can i extract surface from this grid, so that i can make my own mesh.

jchawner · December 11, 2011, 17:39

Rohan:

I'm surprised that ANSYS ICEM can't read a PLOT3D file. My suggestion is to verify the PLOT3D file's format and ensure you're giving ICEM the correct options.

PLOT3D is a widely used de facto standard format for structured grids. You can see the format spec here: http://www.grc.nasa.gov/WWW/wind/valid/plot3d.html. Perhaps you could write your own code to extract the surfaces if you can get ICEM to work.

But I repeat: I'd be shocked if ICEM couldn't read that file.

Best Regards

kedarerohan · December 12, 2011, 01:23

Sir, Actually I have found that it is an Chimera mesh (overlapping type), thats why ICEM could not read the mesh. I am not a software person, cant write a code. Can you suggest me any software so that I can extract surface from that mesh, and create my own mesh.

jchawner · December 12, 2011, 10:16

Rohan: Have you tried email the custodian of the web page from which you downloaded the file to see if they have some suggestions?

Martin Hegedus · December 13, 2011, 02:23

I assume you mean the shuttle grid from http://www.nas.nasa.gov/Resources/datasets.html Those files are in big-endian format so, if you are using an intel box, the program that reads in the file will need to realize this and switch it to little-endian.

JBeilke · December 13, 2011, 03:25

Just rename the grid file to grid.xyz and read it with EnSight or Paraview.

The data are in PLOT3D, multiple-zone, iblank, binary. All floating point data are in 32-bit IEEE format, big endian.

December 8, 2011, 02:11	How to extract surface from plot3d grid (NASA chimera mesh)	#1
kedarerohan New Member Rohan V. Kedare Join Date: Sep 2011 Posts: 3 Rep Power: 15	Hi, Can anybody tell me how to extract surface from plot3d mesh. Insist me some software that reads plot3d format grid. I have taken mesh from nasa website of space shuttle launch vehicle. Its an chimera grid in plot3d format. This mesh doesnot open in Ansys ICEM. What is the reason. If not can can i extract surface from this grid, so that i can make my own mesh.

December 11, 2011, 17:39		#2
jchawner Senior Member John Chawner Join Date: Mar 2009 Location: Fort Worth, Texas, USA Posts: 275 Rep Power: 18	Rohan: I'm surprised that ANSYS ICEM can't read a PLOT3D file. My suggestion is to verify the PLOT3D file's format and ensure you're giving ICEM the correct options. PLOT3D is a widely used de facto standard format for structured grids. You can see the format spec here: http://www.grc.nasa.gov/WWW/wind/valid/plot3d.html. Perhaps you could write your own code to extract the surfaces if you can get ICEM to work. But I repeat: I'd be shocked if ICEM couldn't read that file. Best Regards __________________ John Chawner / jrc@pointwise.com / www.pointwise.com Blog: http://blog.pointwise.com/ on Twitter: @jchawner

December 12, 2011, 10:16		#4
jchawner Senior Member John Chawner Join Date: Mar 2009 Location: Fort Worth, Texas, USA Posts: 275 Rep Power: 18	Rohan: Have you tried email the custodian of the web page from which you downloaded the file to see if they have some suggestions? __________________ John Chawner / jrc@pointwise.com / www.pointwise.com Blog: http://blog.pointwise.com/ on Twitter: @jchawner

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December 12, 2011, 01:23		#3
kedarerohan New Member Rohan V. Kedare Join Date: Sep 2011 Posts: 3 Rep Power: 15	Sir, Actually I have found that it is an Chimera mesh (overlapping type), thats why ICEM could not read the mesh. I am not a software person, cant write a code. Can you suggest me any software so that I can extract surface from that mesh, and create my own mesh.

December 13, 2011, 02:23		#5
Martin Hegedus Senior Member Martin Hegedus Join Date: Feb 2011 Posts: 500 Rep Power: 19	I assume you mean the shuttle grid from http://www.nas.nasa.gov/Resources/datasets.html Those files are in big-endian format so, if you are using an intel box, the program that reads in the file will need to realize this and switch it to little-endian.

December 13, 2011, 03:25		#6
JBeilke Senior Member Joern Beilke Join Date: Mar 2009 Location: Dresden Posts: 516 Rep Power: 20	Just rename the grid file to grid.xyz and read it with EnSight or Paraview. The data are in PLOT3D, multiple-zone, iblank, binary. All floating point data are in 32-bit IEEE format, big endian.