Discussion Forum

Hi

in 2D and 2D axi the integration over an edge is in 2D assumed over an area of by default 1[m] depth (slightly physics dependent, always check the main physics node for default depth ("d" or "thickness" values)

in 2D-axi you must multiply by 2*pi*r the "loop length" tis can be done ba COMSOL in Results post processing mode if you go to the advanced tab ana select integrate over volumes for 2D-axi. But you must specify it manually if you use "operator" or integration coupling variables

--
Good luck
Ivar

Thanks Ivar for advice, for 2-D axis, similar integration can be found at tutorial-peristaltic pump. Quite nice the simulation.

However, for my case, I am applying 2-D where integration over the boundary will only create area flow rate [m^2/s].
Is there any possible we can have volume flow rate [m^3/s]?

Thanks and appreciate for advice.

Hi

I believe its so if you multiply by the depth "z" direction, as an edge in 2D is a surface of a given depth (mostly by default 1[m]

--
Good luck
Ivar

Hi Ivar,

I am trying with the Results post processing boundary integration mode but it only shows area flow rate when I select the inlet boundary. and surface integral is only applied to axisymmetric mode. Thus, I think the flow rate only applied to area flow rate in 2-D mode.

Hi

I'm somewhat confused now, it's difficult to understand correctly only with words.

Have you tried to make a simple example, that you can easily check by a simple analytical formula, then you ususlly arrive to better understand the relationship required, or missing

--
Good luck
Ivar