result output (mass flow rate) & conservation of mass

alpharays786

Hi all,

 

 

I ran a simulation of air flow through ducting. It has one inlet (mass flow rate) and 4 outlets.

I want to measure the mass flow rate at each outlets.

Because of no mass flow rate as selection in the AcuFieldView, velocity magnitude is used to multiple with outlet's area and air density.

 

mass flow rate = density x area x velocity

 

However, mass flow rate calculated did not follow conservation of mass unless I choose directional velocity (x or y or z-velocity) which normal to outlet's surface. And, directional velocity used could lead to less accurate of mass flow rate if outlet surface is not normal to x/y/z axis.

 

Is there any method to calculate mass flow rate directly or if AcuFieldView has add-on extension for this?

 

 

Thanks

ydigit

The easiest way to monitor mass flux is using AcuProbe.

Surface Output > 'surface name' > mass_flux

 

You could also create a UDF in AcuProbe

value= Get( 'Surface Output - Outlet - mass_flux' ) + Get( 'Surface Output - Inlet - mass_flux' )

 

Note the sign is 'plus' in the above snippet, due to sign conventions.