looking for boundary condition

nkjsimulating · November 13, 2013, 07:04

Hi CFD users,

Refer enclosed picture.

I have a rotating fan in between int1 and int2. I am looking for the situation where the net static pressure/ net total pressure measured between PL1 and PL2 has x(eg. 10 Pa) value and mass flow rate y (e.g. 0.1 m3/min) value.

can any one suggest the methodology ??

any kind of help is appreicated.

thnks

vigii · November 13, 2013, 07:15

Hi Niraj,

If I'm correct you want to display the values over pl1 and pl2 for pressure and mass flow rate.

You can use area weighted average over the the plane pl1 and pl2.

goto reports tab->surface integral.

Regards,
Vignesh

nkjsimulating · November 13, 2013, 09:51

Hi Vignesh,

Thanks .

I am clear about that but exactly i am looking for the kind of BC at inlet and outlet to achieve my result as a correct pressure drop in between PL1 and PL2.

flotus1 · November 13, 2013, 14:10

As far as I know, you cannot specify both pressure difference AND mass flow rate.
One of these has to be the result of the simulation, depending on what happens between the inlet and outlet.
You can either specify a pressure difference using pressure inlet and outlet boundary conditions or a mass flow rate with a combination of massflow inlet/outlet and pressure outlet/inlet.

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November 13, 2013, 07:15		#2
vigii Member Vignesh KPV Join Date: Oct 2011 Location: Bangalore Posts: 83 Rep Power: 15	Hi Niraj, If I'm correct you want to display the values over pl1 and pl2 for pressure and mass flow rate. You can use area weighted average over the the plane pl1 and pl2. goto reports tab->surface integral. Regards, Vignesh

November 13, 2013, 09:51		#3
nkjsimulating New Member Niraj Join Date: Jul 2013 Location: Germany Posts: 15 Rep Power: 13	Hi Vignesh, Thanks . I am clear about that but exactly i am looking for the kind of BC at inlet and outlet to achieve my result as a correct pressure drop in between PL1 and PL2.

November 13, 2013, 14:10		#4
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,427 Rep Power: 49	As far as I know, you cannot specify both pressure difference AND mass flow rate. One of these has to be the result of the simulation, depending on what happens between the inlet and outlet. You can either specify a pressure difference using pressure inlet and outlet boundary conditions or a mass flow rate with a combination of massflow inlet/outlet and pressure outlet/inlet.