Mass Flow Rate Not Available?

trex930 · July 11, 2010, 23:10

Hi all,

Im trying to obtain the mass flow rate of an exhaust that im simulating. However, when ever the report runs, it just says

Note: Field funciton mass Flow Rate is not available inside Region 1 for smoothing. Using zero except at boundaries where it is defined.

Has anyone encoutered this issue before?

Heres the background of my project.
I have an nozzle spraying upwards into an 'ejector' to the right of the nozzle, there is a long tube, and at the end of the exhaust and the tube, I put two large boxes and set one face boundary to free stream. Does that seem correct to anyone?

Thanks in advance,
T

vishyaroon · July 12, 2010, 10:41

Are you trying to get the mass flow rate in a plane section or some derived part that you have generated? If you are trying to plot the mass flow rate for this part then the warning is generated.

trex930 · July 14, 2010, 01:37

New Question! Didnt want to bombard this forum with another thread.

I was curious as to what parameter in StarCCM+ controls the Tdr.

I ran a simulation with decent results, but then i run it on a similar geometry and the Tdr goes all haywire! The two geometries are VERY similar. And I dont understand whats going on!

And lastly, the Residuals given in StarCCM+, are they absolute or relative residuals??

trex930 · August 10, 2010, 21:04

Can anyone help me out?

Vinicius · August 11, 2010, 08:21

The residuals are normalized... if you wnat to see the absulte, go to the monitors folder and at each monitor change the normalization option to Off..

July 11, 2010, 23:10	Mass Flow Rate Not Available?	#1
trex930 Member Join Date: Jun 2010 Posts: 33 Rep Power: 15	Hi all, Im trying to obtain the mass flow rate of an exhaust that im simulating. However, when ever the report runs, it just says Note: Field funciton mass Flow Rate is not available inside Region 1 for smoothing. Using zero except at boundaries where it is defined. Has anyone encoutered this issue before? Heres the background of my project. I have an nozzle spraying upwards into an 'ejector' to the right of the nozzle, there is a long tube, and at the end of the exhaust and the tube, I put two large boxes and set one face boundary to free stream. Does that seem correct to anyone? Thanks in advance, T

July 14, 2010, 01:37		#3
trex930 Member Join Date: Jun 2010 Posts: 33 Rep Power: 15	New Question! Didnt want to bombard this forum with another thread. I was curious as to what parameter in StarCCM+ controls the Tdr. I ran a simulation with decent results, but then i run it on a similar geometry and the Tdr goes all haywire! The two geometries are VERY similar. And I dont understand whats going on! And lastly, the Residuals given in StarCCM+, are they absolute or relative residuals?? Last edited by trex930; August 10, 2010 at 21:02.

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July 12, 2010, 10:41		#2
vishyaroon Senior Member Aroon Join Date: Apr 2009 Location: Racine WI Posts: 148 Rep Power: 17	Are you trying to get the mass flow rate in a plane section or some derived part that you have generated? If you are trying to plot the mass flow rate for this part then the warning is generated.

August 10, 2010, 21:04		#4
trex930 Member Join Date: Jun 2010 Posts: 33 Rep Power: 15	Can anyone help me out?

August 11, 2010, 08:21		#5
Vinicius Member Vinicius Girardi Join Date: Mar 2009 Location: Sao Paulo, Brazil Posts: 80 Rep Power: 17	The residuals are normalized... if you wnat to see the absulte, go to the monitors folder and at each monitor change the normalization option to Off..