Velocity Loss Models

KRSU · May 25, 2009, 08:27

Hi All,

Could you please help me to expalin the difference between the superficial and true velocity loss models?

How that affects my results for my given volume porosity and loss co efficients?

Thanks in advacne!

KRSU · May 25, 2009, 10:50

Hi All,

I will be grateful if you can help me about the following:

1. I am using the Volume poros model to model the car radiator. For that, I have Pressure drop cuve by wind tunnel experiments. I have found linear and quadratic co efficients also by curve fitting method. Then, from the CAD drawing I found the volume porosity as well. Kindly suggest me how can I get the exact porous model of the car radiator.
2. Whether should use Tru velocity or Superficail Velocity if I use Isotropic loss model?

Thanks in advance!

KRSU · May 27, 2009, 01:09

Please click one of the Quick Reply icons in the posts above to activate Quick Reply.

KRSU · May 27, 2009, 01:20

Dear CFX Users,

Moreover, kindly let me know whether should I use Momentum source also?

Thanks and regards

bharath · May 28, 2009, 21:10

hi,
1)if u haven't tried the tutorial try to do it first.
2)you can use both superficial and true velocity models.it depends what velocity you used, when you use to calculate resistance coefficients.
3)if u need just the pressure drop only you go for loss models.or if u need the velocity variation across the porous media you go for other models.

May 25, 2009, 08:27	Velocity Loss Models	#1
KRSU New Member KRSU Join Date: May 2009 Posts: 4 Rep Power: 16	Hi All, Could you please help me to expalin the difference between the superficial and true velocity loss models? How that affects my results for my given volume porosity and loss co efficients? Thanks in advacne!

May 25, 2009, 10:50	Porous Model	#2
KRSU New Member KRSU Join Date: May 2009 Posts: 4 Rep Power: 16	Hi All, I will be grateful if you can help me about the following: 1. I am using the Volume poros model to model the car radiator. For that, I have Pressure drop cuve by wind tunnel experiments. I have found linear and quadratic co efficients also by curve fitting method. Then, from the CAD drawing I found the volume porosity as well. Kindly suggest me how can I get the exact porous model of the car radiator. 2. Whether should use Tru velocity or Superficail Velocity if I use Isotropic loss model? Thanks in advance!

May 27, 2009, 01:20	Porous Model	#4
KRSU New Member KRSU Join Date: May 2009 Posts: 4 Rep Power: 16	Dear CFX Users, Moreover, kindly let me know whether should I use Momentum source also? Thanks and regards Last edited by KRSU; May 28, 2009 at 02:02.

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May 27, 2009, 01:09		#3
KRSU New Member KRSU Join Date: May 2009 Posts: 4 Rep Power: 16	Please click one of the Quick Reply icons in the posts above to activate Quick Reply.

May 28, 2009, 21:10		#5
bharath Senior Member Bharath kumar Join Date: Apr 2009 Posts: 169 Rep Power: 17	hi, 1)if u haven't tried the tutorial try to do it first. 2)you can use both superficial and true velocity models.it depends what velocity you used, when you use to calculate resistance coefficients. 3)if u need just the pressure drop only you go for loss models.or if u need the velocity variation across the porous media you go for other models.