time dependent mass flow rate

niharika · May 6, 2016, 06:10

can anyone help me on how to give time dependent mass flow rate in inform.
My geometry is in polar coordinate system and is 3m long. The inlet is at z=0 and i have to specify mass flow rate varying with time. I have created a patch and tried the following statements.
(source of p1 at patch is win*rho1)
(source of w1 at patch is win)
the solver is running but i am unable to achieve the expected results. Can anyone help me

Thank you

RD-CHAM · September 20, 2017, 12:41

Hi,

You will need to write the following for specifying a mass flow:

(source of p1 at patch is coval(fixflu,win*rho1) with area)
(source of w1 at patch is coval(onlyms,win))

You will then need to apply a time varying component to the simple statements above. A simple sinusoidal function can implented as below:

real(denin,pi,omega,period,uin,mflow)
denin=1.
pi=atan(1)*4
period=1.0
omega = 2*pi/period
uin=1.0
mflow=uin*denin
(initial of p1 is mflow)
(initial of u1 is uin)
(Source of p1 at inlet is coval(fixflu,mflow*SIN(omega*TIM)) with area)
(source of u1 at inlet is uin*SIN(omega*TIM) with onlyms)

Thanks

May 6, 2016, 06:10	time dependent mass flow rate	#1
niharika New Member niharika Join Date: Feb 2016 Posts: 3 Rep Power: 9	can anyone help me on how to give time dependent mass flow rate in inform. My geometry is in polar coordinate system and is 3m long. The inlet is at z=0 and i have to specify mass flow rate varying with time. I have created a patch and tried the following statements. (source of p1 at patch is win*rho1) (source of w1 at patch is win) the solver is running but i am unable to achieve the expected results. Can anyone help me Thank you

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September 20, 2017, 12:41		#2
RD-CHAM New Member Join Date: Sep 2017 Posts: 9 Rep Power: 7	Hi, You will need to write the following for specifying a mass flow: (source of p1 at patch is coval(fixflu,winrho1) with area) (source of w1 at patch is coval(onlyms,win)) You will then need to apply a time varying component to the simple statements above. A simple sinusoidal function can implented as below: real(denin,pi,omega,period,uin,mflow) denin=1. pi=atan(1)4 period=1.0 omega = 2pi/period uin=1.0 mflow=uindenin (initial of p1 is mflow) (initial of u1 is uin) (Source of p1 at inlet is coval(fixflu,mflowSIN(omegaTIM)) with area) (source of u1 at inlet is uinSIN(omegaTIM) with onlyms) Thanks