Field Function Results Not Correct

fluid23 · August 17, 2015, 10:27

Can anyone explain to me why some of my field functions are not getting calculated properly? I have a field function, call it fz, that is of the form:

42571.79*$massflowReport*$massflowReport-95.09*$massflowReport

The $massflowReport is a mass flow report (as you might have guessed). It returns a value of 0.0446 lbm/s. Which should return a value of fz equal to ~80.462.

However, if I setup a maximum value report to get the value of fz (which is constant everywhere) it returns a value of 0.01016.

I am at a loss to explain this. Any advice?

fluid23 · August 17, 2015, 12:15

Solved...

It turns out that field functions always use the SI value of whatever report you call. So what was happening is that the coefficients of the function I gave assumed that mass flow report was in lb/s but it was actually in kg/s. After re-deriving my coefficients in SI uints, the values are being calculated correctly.

August 17, 2015, 10:27	Field Function Results Not Correct	#1
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 17	Can anyone explain to me why some of my field functions are not getting calculated properly? I have a field function, call it fz, that is of the form: 42571.79$massflowReport$massflowReport-95.09*$massflowReport The $massflowReport is a mass flow report (as you might have guessed). It returns a value of 0.0446 lbm/s. Which should return a value of fz equal to ~80.462. However, if I setup a maximum value report to get the value of fz (which is constant everywhere) it returns a value of 0.01016. I am at a loss to explain this. Any advice?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[blockMesh] Errors during blockMesh meshing	Madeleine P. Vincent	OpenFOAM Meshing & Mesh Conversion	51	May 30, 2016 10:51
[snappyHexMesh] How to define to right point for locationInMesh	Mirage12	OpenFOAM Meshing & Mesh Conversion	7	March 13, 2016 14:07
[swak4Foam] installation problem with version 0.2.3	Claudio87	OpenFOAM Community Contributions	9	May 8, 2013 10:20
Version 15 on Mac OS X	gschaider	OpenFOAM Installation	113	December 2, 2009 10:23
Problem with compile the setParabolicInlet	ivanyao	OpenFOAM Running, Solving & CFD	6	September 5, 2008 20:50

August 17, 2015, 12:15		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 17	Solved... It turns out that field functions always use the SI value of whatever report you call. So what was happening is that the coefficients of the function I gave assumed that mass flow report was in lb/s but it was actually in kg/s. After re-deriving my coefficients in SI uints, the values are being calculated correctly.