read binary tensor field

f0208secretx · August 17, 2015, 22:20

Hi Foamers,

I have velocity gradient output at every time step in binary, compressed format using calcFvcGrad library. I now want to write a custom binary reader to port this data for each time step to other solvers I wrote. I can't seem to find the descriptions of how this binary is formatted anywhere. I need to know precision, order of array (NCell*9 matrix), corresponding vertex/cell position etc. Will appreciate for any help. Thanks.

wyldckat · August 18, 2015, 14:32

Quote:

Originally Posted by f0208secretx

I can't seem to find the descriptions of how this binary is formatted anywhere. I need to know precision, order of array (NCell*9 matrix), corresponding vertex/cell position etc. Will appreciate for any help. Thanks.

Quick answer:

The order is the exact same as when writing in "ascii".
The precision is part of one of the build options. You can check by running:
Code:
```
echo $WM_ARCH_OPTION
echo $WM_PRECISION_OPTION
```
which should tell you if it's built with 32 or 64-bit and if Single or Double Precision (SP or DP).
For the format of the tensor, check the programmer's guide (references: http://openfoamwiki.net/index.php/Ma...rGuideAddendum ) or check the source code of the test utility "applications/test/tensor".

August 17, 2015, 22:20	read binary tensor field	#1
f0208secretx Member J.-H. Wang Join Date: Oct 2010 Posts: 72 Rep Power: 15	Hi Foamers, I have velocity gradient output at every time step in binary, compressed format using calcFvcGrad library. I now want to write a custom binary reader to port this data for each time step to other solvers I wrote. I can't seem to find the descriptions of how this binary is formatted anywhere. I need to know precision, order of array (NCell*9 matrix), corresponding vertex/cell position etc. Will appreciate for any help. Thanks.

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