Reynolds No Manually Input

RupamNew · June 12, 2018, 04:12

Is it possible to input Reynolds No Manually in Ansys cfx. After Solution, it is showing some value of Reynolds No. How is it Calculated by Ansys cfx?
Please Help me Out....

ghorrocks · June 12, 2018, 18:56

CFX is a dimensional solver. Therefore it uses units of length, time, temperature and not non-dimensional numbers. So if you want to run a defined Reynolds Number you need to define a velocity, length scale and fluid properties which give the Reynolds number you want.

The Reynolds number reported by CFX in the output file by default is an estimate. For the velocity it uses an averaged velocity over the entire field, for a length scale it uses the cube root of the volume of the domain and averaged fluid properties. This will not usually match most definitions of Reynolds Number, such as a pipe Reynolds Number defined by the pipe diameter and average flow velocity on a cross section.

June 12, 2018, 04:12	Reynolds No Manually Input	#1
RupamNew New Member Rupam Das Join Date: Jun 2018 Posts: 1 Rep Power: 0	Is it possible to input Reynolds No Manually in Ansys cfx. After Solution, it is showing some value of Reynolds No. How is it Calculated by Ansys cfx? Please Help me Out....

June 12, 2018, 18:56		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,830 Rep Power: 144	CFX is a dimensional solver. Therefore it uses units of length, time, temperature and not non-dimensional numbers. So if you want to run a defined Reynolds Number you need to define a velocity, length scale and fluid properties which give the Reynolds number you want. The Reynolds number reported by CFX in the output file by default is an estimate. For the velocity it uses an averaged velocity over the entire field, for a length scale it uses the cube root of the volume of the domain and averaged fluid properties. This will not usually match most definitions of Reynolds Number, such as a pipe Reynolds Number defined by the pipe diameter and average flow velocity on a cross section. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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