Mass Averaged Report

hirsch1003 · April 22, 2013, 10:59

Hey everybody,

first my set-up: i've got a tandem profile, three dimensional with about 5 million cells and i am trying to calculate the pressure loss coefficient in a plane behind the profile.

so my problem is, that i need to have a mass-averaged report ( to compare it with values from fluent), but the mass-averaged report apparently just works with volumes in star ccm+, but with the derived parts options i cant build like a cubes just planes or spheres, which arent helping.

so my question ist pretty much, is it possible to extrude the meassurement plane, so that i get a volume? or can i for example somehow create a cube in the derived parts?

thanks in advance!

rwryne · April 22, 2013, 16:09

Try using a cell surface instead.

Create your derived part cutplane where you want it, then make a cell surface using that cutplane as input.

Then use a sum report over the cell surface and sum Mass*<Your scalar> and another sum for just mass and divide them

hirsch1003 · April 23, 2013, 04:01

hey, good idea and with that you brought me to another solution, thats what i did:

i definded another userfieldfunction which was Mass*<Scalar>. after that i calculated the mass and my mass*<scalar> with a surface integral, divide both with each other and i got some comparable values. ( and i think its the same fluent does, when i do a mass averaged surface integral).
thank you so much!

April 22, 2013, 10:59	Mass Averaged Report	#1
hirsch1003 New Member Join Date: Apr 2013 Posts: 2 Rep Power: 0	Hey everybody, first my set-up: i've got a tandem profile, three dimensional with about 5 million cells and i am trying to calculate the pressure loss coefficient in a plane behind the profile. so my problem is, that i need to have a mass-averaged report ( to compare it with values from fluent), but the mass-averaged report apparently just works with volumes in star ccm+, but with the derived parts options i cant build like a cubes just planes or spheres, which arent helping. so my question ist pretty much, is it possible to extrude the meassurement plane, so that i get a volume? or can i for example somehow create a cube in the derived parts? thanks in advance!

April 22, 2013, 16:09		#2
rwryne Senior Member Ryne Whitehill Join Date: Aug 2009 Posts: 312 Rep Power: 18	Try using a cell surface instead. Create your derived part cutplane where you want it, then make a cell surface using that cutplane as input. Then use a sum report over the cell surface and sum Mass*<Your scalar> and another sum for just mass and divide them rickosgr likes this.

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April 23, 2013, 04:01		#3
hirsch1003 New Member Join Date: Apr 2013 Posts: 2 Rep Power: 0	hey, good idea and with that you brought me to another solution, thats what i did: i definded another userfieldfunction which was Mass<Scalar>. after that i calculated the mass and my mass<scalar> with a surface integral, divide both with each other and i got some comparable values. ( and i think its the same fluent does, when i do a mass averaged surface integral). thank you so much!