Output velocity magnitude

satellite_control · August 4, 2011, 00:31

Hi,

Flow 3D shows velocity magnitude when I analyze in 2D.
But when I try to make a Text output of the velocity magnitude data, I can just find x-velocity, y-velocity and z-velocity.

where can I find the velocity magnitude data to export it?

Should I change my settings in Model-Setup->Output?
My configurations are:
Restart data and history data and hydraulic data.
There is no klick on selected data.

Thank you for your help!

MuxaB · November 30, 2011, 19:07

Velocity magnitude is not explicitly saved into the FLOW-3D data file. It is computed by the post-processor, so it is a derived quantity.

Text output does not have that option, but you can try the following:

1. create a 2d or 3d plot using velocity magnitude as the color variable.
2. after rendering, go back to Analyze and select Custom tab.
3. pick the file flsinp.tmp from the drop-down menu at the top and change the value of omode to -1.
4. click Render and select text for the output. It should pipe all quantities to a text window. I think (!) it should convert velocities to the magnitude.

August 4, 2011, 00:31	Output velocity magnitude	#1
satellite_control New Member Marco S. Join Date: Oct 2010 Posts: 8 Rep Power: 3	Hi, Flow 3D shows velocity magnitude when I analyze in 2D. But when I try to make a Text output of the velocity magnitude data, I can just find x-velocity, y-velocity and z-velocity. where can I find the velocity magnitude data to export it? Should I change my settings in Model-Setup->Output? My configurations are: Restart data and history data and hydraulic data. There is no klick on selected data. Thank you for your help!

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November 30, 2011, 19:07		#2
MuxaB Senior Member michael barkhudarov Join Date: Mar 2009 Posts: 314 Rep Power: 6	Velocity magnitude is not explicitly saved into the FLOW-3D data file. It is computed by the post-processor, so it is a derived quantity. Text output does not have that option, but you can try the following: 1. create a 2d or 3d plot using velocity magnitude as the color variable. 2. after rendering, go back to Analyze and select Custom tab. 3. pick the file flsinp.tmp from the drop-down menu at the top and change the value of omode to -1. 4. click Render and select text for the output. It should pipe all quantities to a text window. I think (!) it should convert velocities to the magnitude.