low Reynolds number problem

johnpaulcd · August 2, 2012, 04:31

pls anybody could tell me how can i define Reynolds number in a forced convection over 4 planar heat sources placed in line inside a test section of a wind tunnel?
the Re curresponds to flow over a flat plate is very low. but its not getting converged in laminar model of FLUENT.

flotus1 · August 2, 2012, 05:21

The characteristic length for the flow over blunt bodies is usually the width of the body.

johnpaulcd · August 7, 2012, 12:55

the heat source is similar to flat plate. but 4 such heat sources are arranged in tandem with a gap of 10 mm between them. so can i consider its total length or length of single heat source for defining the Reynolds number?

flotus1 · August 8, 2012, 03:01

Why is it so important to define a Reynolds number for this case?
For complex flows, the choice of a characteristic length is quite arbitrary.

August 2, 2012, 04:31	low Reynolds number problem	#1
johnpaulcd New Member john Join Date: Jun 2012 Posts: 2 Rep Power: 0	pls anybody could tell me how can i define Reynolds number in a forced convection over 4 planar heat sources placed in line inside a test section of a wind tunnel? the Re curresponds to flow over a flat plate is very low. but its not getting converged in laminar model of FLUENT.

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August 2, 2012, 05:21		#2
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	The characteristic length for the flow over blunt bodies is usually the width of the body.

August 7, 2012, 12:55		#3
johnpaulcd New Member john Join Date: Jun 2012 Posts: 2 Rep Power: 0	the heat source is similar to flat plate. but 4 such heat sources are arranged in tandem with a gap of 10 mm between them. so can i consider its total length or length of single heat source for defining the Reynolds number?

August 8, 2012, 03:01		#4
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	Why is it so important to define a Reynolds number for this case? For complex flows, the choice of a characteristic length is quite arbitrary.