Time Average Vs Ensemble Average

Mohsin · April 12, 2011, 23:46

Hello

Could anyone please tell me the difference between time and ensemble averaging.

It is used in Reynolds average Navier Stokes (RANS) equations. The equations for RANS have the same general form as the instnataneous Navier Stokes equations, with the velocity and other solution variables now representing ensember-averaged (or time averaged) values.

Do time averaged values be used in Unsteady flows and Ensembled average values will be used for Steady flows?

Thank you
Mohsin

idefix · December 4, 2013, 04:48

Hello,

it´s a little bit late,
but here is a discussion of this question:
http://www.cfd-online.com/Forums/cfx...e-average.html

April 12, 2011, 23:46	Time Average Vs Ensemble Average	#1
Mohsin Senior Member Mohsin Mukhtar Join Date: Mar 2010 Location: South Korea Posts: 249 Rep Power: 17	Hello Could anyone please tell me the difference between time and ensemble averaging. It is used in Reynolds average Navier Stokes (RANS) equations. The equations for RANS have the same general form as the instnataneous Navier Stokes equations, with the velocity and other solution variables now representing ensember-averaged (or time averaged) values. Do time averaged values be used in Unsteady flows and Ensembled average values will be used for Steady flows? Thank you Mohsin Waseem Abbas likes this.

December 4, 2013, 04:48		#2
idefix Member Join Date: Aug 2011 Posts: 89 Rep Power: 15	Hello, it´s a little bit late, but here is a discussion of this question: http://www.cfd-online.com/Forums/cfx...e-average.html Waseem Abbas likes this.

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