How to calculate area of a range of values in scalar field?

jamin56 · April 21, 2015, 12:18

I have created a scalar field of the wall shear stress on the floor of my device. I would like to calculate the total area where the WSS is in the range 0.5-1.5 Pascals. Is this possible. I know how to set the upper and lower limits of a scalar field but that doesn't tell me the area in that range.

fluid23 · April 22, 2015, 15:02

That's an interesting challenge. I had to think about it for a sec.

1. Create a Derived Part > Threshold.

2. Set the Input Part to be the desired surface.

3. Set Scalar to Wall Shear Stress.

4. Set Scalar Range to desired interval.

5. Create a displayer and make sure it is the same shape as the clipped scalar plot you already made.

6. Create a Report > Sum and assign Input Part as your threshold, area as your scalar and then set units.

7. Right click the report, select run report.

Let me know if that actually works for you, never tried it myself.

trbo · April 27, 2015, 15:35

My method is similar to that of MBdonCFD. After I create the threshold derived part, I create a surface integral report of a dimensionless unit field function that I created (definition: 1) on that derived part to get the area.

April 21, 2015, 12:18	How to calculate area of a range of values in scalar field?	#1
jamin56 New Member ben Join Date: Apr 2015 Posts: 1 Rep Power: 0	I have created a scalar field of the wall shear stress on the floor of my device. I would like to calculate the total area where the WSS is in the range 0.5-1.5 Pascals. Is this possible. I know how to set the upper and lower limits of a scalar field but that doesn't tell me the area in that range.

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April 22, 2015, 15:02		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 17	That's an interesting challenge. I had to think about it for a sec. 1. Create a Derived Part > Threshold. 2. Set the Input Part to be the desired surface. 3. Set Scalar to Wall Shear Stress. 4. Set Scalar Range to desired interval. 5. Create a displayer and make sure it is the same shape as the clipped scalar plot you already made. 6. Create a Report > Sum and assign Input Part as your threshold, area as your scalar and then set units. 7. Right click the report, select run report. Let me know if that actually works for you, never tried it myself.

April 27, 2015, 15:35		#3
trbo New Member Ken Join Date: Jan 2010 Location: Pittsburgh, PA area Posts: 2 Rep Power: 0	My method is similar to that of MBdonCFD. After I create the threshold derived part, I create a surface integral report of a dimensionless unit field function that I created (definition: 1) on that derived part to get the area.