Reference values

vipingawande · July 19, 2013, 07:12

Dear sir
I am calculating Average Nusselt Number in Fluent....

I am changing the reference value .....

what is the effect of reference value on solution?

How to set it with reference to a problem?

I am simulating 2D rectangular duct with Heat flux is given at middle of duct

inlet temp= 300 k

i am changing reference temp to some other values.....

help me.....

flotus1 · July 20, 2013, 12:46

The reference values in Fluent do not affect the solution. They are used for the calculation of dimensionless numbers.

vipingawande · July 20, 2013, 13:00

If I changed reference temp to get the required Nusselt Number ...is it a valid solution.
How to set reference temp for Nu no.?

flotus1 · July 22, 2013, 04:20

The reference values are those you would take if you calculated dimensionless numbers yourself.
You would not take 5m as a reference length to calculate the Reynolds number if the characteristic length of your flow setup was 1m.

I know nothing about your heat transfer setup, but I guess the correct reference value for the temperature is the free stream temperature at the inlet.

Or, since you obviously want to compare the results to another source, you should take the same temperature as in the reference work you are comparing to.

July 19, 2013, 07:12	Reference values	#1
vipingawande New Member Vipin Join Date: Jul 2013 Posts: 4 Rep Power: 12	Dear sir I am calculating Average Nusselt Number in Fluent.... I am changing the reference value ..... what is the effect of reference value on solution? How to set it with reference to a problem? I am simulating 2D rectangular duct with Heat flux is given at middle of duct inlet temp= 300 k i am changing reference temp to some other values..... help me.....

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July 20, 2013, 12:46		#2
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	The reference values in Fluent do not affect the solution. They are used for the calculation of dimensionless numbers.

July 20, 2013, 13:00		#3
vipingawande New Member Vipin Join Date: Jul 2013 Posts: 4 Rep Power: 12	If I changed reference temp to get the required Nusselt Number ...is it a valid solution. How to set reference temp for Nu no.?

July 22, 2013, 04:20		#4
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	The reference values are those you would take if you calculated dimensionless numbers yourself. You would not take 5m as a reference length to calculate the Reynolds number if the characteristic length of your flow setup was 1m. I know nothing about your heat transfer setup, but I guess the correct reference value for the temperature is the free stream temperature at the inlet. Or, since you obviously want to compare the results to another source, you should take the same temperature as in the reference work you are comparing to.