How to make data file for matlab from CFX?

July 18, 2002, 17:18

Everyone: I want to draw 3d picture by matlab. But the data file (containing the velocity and pressure of a certain plane)I got from the result of CFX5 by "export" command is not fit to matlab.The data is not in order.For example, if x=0,y should be 0,2,4,6,8,10,12, x=2, y should be 0,2,3,4,6,8,10,12.But the data file is not in such way.For example, when x=0 y=0,2,4,6,8,10,12; when x=2,y=2,6,12(some positions have no data be exported).So I cannot draw satisfied picture from such data file by matlab. I think it is because the mesh of CFX5 is unstructured grid.How to resolve it? I have fieldview, it can export data of a certain plane by "export" command.But the file made by fieldview has the same problem. How to resolve this problem? Thank you!

July 22, 2002, 13:13

Probably you can use keyword GRID CENTRES in
:>PRINT OPTIONS
:>WHAT

... ?

July 24, 2002, 17:59

Read your data into a spreadsheet application and reorder it.

Robin

August 15, 2002, 10:34

What I do is to first "re-map" the data from CFX 5 onto a structured mesh. I use the MATLAB comands delaunay, tsearch and dsearch to interpolate the raw data onto my custom defined structured grid. Then go wild with the data analysis....

René

October 19, 2002, 08:56

firstly check your output data. try command griddata in matlab.

July 18, 2002, 17:18	How to make data file for matlab from CFX?	#1
cfxbeginner Guest Posts: n/a	Everyone: I want to draw 3d picture by matlab. But the data file (containing the velocity and pressure of a certain plane)I got from the result of CFX5 by "export" command is not fit to matlab.The data is not in order.For example, if x=0,y should be 0,2,4,6,8,10,12, x=2, y should be 0,2,3,4,6,8,10,12.But the data file is not in such way.For example, when x=0 y=0,2,4,6,8,10,12; when x=2,y=2,6,12(some positions have no data be exported).So I cannot draw satisfied picture from such data file by matlab. I think it is because the mesh of CFX5 is unstructured grid.How to resolve it? I have fieldview, it can export data of a certain plane by "export" command.But the file made by fieldview has the same problem. How to resolve this problem? Thank you!

July 22, 2002, 13:13	Re: How to make data file for matlab from CFX?	#2
Tommaso Guest Posts: n/a	Probably you can use keyword GRID CENTRES in :>PRINT OPTIONS :>WHAT ... ?

July 24, 2002, 17:59	Re: How to make data file for matlab from CFX?	#3
Robin Guest Posts: n/a	Read your data into a spreadsheet application and reorder it. Robin

August 15, 2002, 10:34	Re: How to make data file for matlab from CFX?	#4
René Guest Posts: n/a	What I do is to first "re-map" the data from CFX 5 onto a structured mesh. I use the MATLAB comands delaunay, tsearch and dsearch to interpolate the raw data onto my custom defined structured grid. Then go wild with the data analysis.... René

October 19, 2002, 08:56	Re: How to make data file for matlab from CFX?	#5
DingEnbao Guest Posts: n/a	firstly check your output data. try command griddata in matlab.

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