# Reference Values- Reference Area

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 March 11, 2008, 02:16 Reference Values- Reference Area #1 Shivakanth Guest   Posts: n/a HI, I am relatively new to Fluent and bit confused over the reference values setting. As I followed the examples, sometimes they are considering projected area( ex:cylinder) normal to the flow and in some cases length of the object(ex: aerofoil). Could some one explain me the proper area to be selected? Thanks, Shivakanth.

 March 11, 2008, 03:40 Re: Reference Values- Reference Area #2 Syed Shabbar Raza Guest   Posts: n/a it really simple, for example if you have to calculate the drag coefficient for a geometry, like flow passing a cylinder, in this case you have to specify its bases area for its reference area, if you remember the formula of drag coefficient, there is an area term present and this area term is taken as reference area in fluent. same with length, when u have to calculate moment coefficient you have to specify it !! hope u understand !! sajid likes this.

 March 11, 2008, 14:57 Re: Reference Values- Reference Area #3 Shivakanth Guest   Posts: n/a Hi Syed... Thanks. Just for confirmation, if a take a plate bent in the form of an arc, the arc length would be reference area(unit depth) and reference length right? Thanks, Shivakanth.

 March 12, 2008, 01:54 Re: Reference Values- Reference Area #4 Syed Shabbar Raza Guest   Posts: n/a dear, when ever u generate a report, always mention your reference condition becasue for certain gemotries like a sphere, it is understood to take its projected area as reference area, so therefore i advise u only to take standard refernce for an analysis,else where ever mention. the question of reference parameters are stickly concerned with the geometry and type of problem, therefore do mention your reference condition in your report so other could understand it. for fun, just take a problem concerning flow over a cylinder form any fluid mechanics book, solve it both analyticaly and computationally then u will have an idea of reference parameter

 March 12, 2008, 02:07 Re: Reference Values- Reference Area #5 shivakanth Guest   Posts: n/a Hey Syed... Thanx.. as u said, let me do some homework and get back to you.

 April 18, 2010, 05:48 reference value #6 New Member   hassan Join Date: Jun 2009 Posts: 14 Rep Power: 9 hi sir could u plz told me about refence value i wana calclate surface nuselt no in expansion pipe( diffrent diameter ) with down strean what should i used for : temprature lenghth area height velocity ;;;;;;; thank u

 December 1, 2011, 14:18 Depends on your problem #7 New Member   Kamran Join Date: Nov 2010 Posts: 8 Rep Power: 7 Bro, it entirely depends on your problem..what you have taken temperature, length, and depth..

December 13, 2012, 16:30
area problem
#8
New Member

Chaudhary
Join Date: Dec 2012
Location: Pakistan
Posts: 8
Rep Power: 5
i want to calculate area of circles which would be used in ansys fluent ....
it is 2d heat exchanger and i have problem how to calculate area of circle in front of flow or which area i have to put in reference value ..
i have confusion whether i have to use area of 2 or 4 circles ???
kindly tell me how to calculate this area or which area i have to put in reference value ??? i have attached the jpeg. file of structure to further explain it ?
waiting for answer...i will be very thankful to you.
what Reference values should I used in fluent to find the area as defaults values are 1 for area,depth and length.
Area=?
Depth=?
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 1.jpg (21.7 KB, 159 views)

 August 26, 2014, 18:40 #9 New Member   Arif Alam Join Date: Mar 2014 Posts: 2 Rep Power: 0 hey guys. i m new at cfd.i want to find the lift and drag,moment coefficint of an aircraft.but in case of reference value i have some problem.what should be the reference values for this.and what is this 'compute from'. plz guys if anyone has any solution help me.

October 19, 2014, 08:42
#10
New Member

nabaouia
Join Date: Aug 2014
Posts: 14
Rep Power: 4
i have the same problem and really fed up
my geometry is : the computatinal box 400mm* 750 mm the diameter of the cylinder is D=15mm. Re =150 .velocity inlet = 0.1460735 .
the problem is how to set the reference values : when i set reference area = Pi*D (seen as a lateral area ) depth =1 and length = Pi *D/2
i found the average of drag coefficient 0.45 less than 1.34 (value found in litterature ) so i change length to 1 and depth to 3 (3 = 1.34/ 0.45 ) i found values recommended but why 3 ????????????????????
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 forum cfd online.docx (72.5 KB, 91 views)

 October 2, 2015, 09:03 Unavaileble reported araeas- FLUENT #11 New Member   Join Date: Apr 2015 Posts: 19 Rep Power: 3 Hello every one, I am working on simulating 2-D flow passing a circular cylinder. I got a problem with the reports> projected areas, it is not available on the screen and I can't get the parameters that I need which is the projected surface area. Can anyone help me with that? Many Thanks Oula

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