Calculate mass flowrate

Hamilton · March 7, 2015, 06:35

Dear guys
In fact I have simulated free convection in a duct but I do not know how to define a surface to calculate the mass flow rate of fluid passing from the duct. The geometry and the contour of velocity in duct is shown in attached figs. Would you please help me?

Sincerely

ghorrocks · March 8, 2015, 05:19

It is often easiest to define surfaces like this during meshing.

But you can do it in post processing a few ways:
* Define a plane and use the extent option
* Define a function like r = x^2+y^2, then do a contour of r. You can then extract the contour as a user surface
* Define a set of functions like:
x=if(x>10[m],if(x<11[m],1,0),0)
y=if(y>3[m],if(y<4[m],1,0),0)
r = x*y
Then do a contour of r and extract the user surface.
* There are lots of other ways, I am sure you will fine plenty by playing around.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[OpenFOAM] Calculate mass flow	aurore	ParaView	8	February 24, 2022 17:52
How to calculate particle mass flow rate at outlet	Randy	FLUENT	6	April 29, 2020 14:47
questions about species transport through walls	shuqin	FLUENT	13	April 9, 2014 03:42
how can i calculate mass flow rate in section?	yossir4	FLUENT	2	November 10, 2013 11:46
Calculate Mass Flow in a faceSet during calculation	torvic	OpenFOAM Running, Solving & CFD	1	August 11, 2008 20:05

March 8, 2015, 05:19		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	It is often easiest to define surfaces like this during meshing. But you can do it in post processing a few ways: * Define a plane and use the extent option * Define a function like r = x^2+y^2, then do a contour of r. You can then extract the contour as a user surface * Define a set of functions like: x=if(x>10[m],if(x<11[m],1,0),0) y=if(y>3[m],if(y<4[m],1,0),0) r = xy Then do a contour of r and extract the user surface. There are lots of other ways, I am sure you will fine plenty by playing around.