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Grid resolution and turbulent inflow boundary condition recommendations for NPARC calculationsThe effects of grid resolution and specification of turbulent inflow boundary conditions were examined using the NPARC code with the Baldwin-Lomax and Chien k-e turbulence models. Three benchmark turbulent test cases were calculated: two were wall bounded flows and the third was a compressible mixing layer. The wall bounded flows were essentially insensitive to axial grid density; however, the location of the first point off the wall had a substantial effect on flow solutions. It was determined that the first point off the wall must be in the laminar sublayer (y+ less than or equal to 5) for the entire boundary layer. For the compressible mixing layer cases, the axial grid density affected the capturing of oblique shock waves in the mixing region, but the overall mixing rate was not strongly dependent on grid resolution. In specifying the inflow turbulent boundary conditions, it was very important to match the boundary layer and momentum thicknesses of the two flows entering the mixing region; calculations obtained with smaller or no boundary layers resulted in substantially reduced mixing. The solutions were relatively insensitive to freestream turbulence level.
Document ID
19950023832
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Georgiadis, Nicholas J. (NASA Lewis Research Center Cleveland, OH, United States)
Dudek, Julianne C. (NASA Lewis Research Center Cleveland, OH, United States)
Tierney, Thomas P. (Massachusetts Inst. of Tech. Cambridge, MA., United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1995
Subject Category
Aerodynamics
Report/Patent Number
NASA-TM-106959
NAS 1.15:106959
E-9711
AIAA PAPER 95-2613
Meeting Information
Meeting: Joint Propulsion Conference and Exhibit
Location: San Diego, CA
Country: United States
Start Date: July 10, 1995
End Date: July 12, 1995
Accession Number
95N30253
Funding Number(s)
PROJECT: RTOP 537-02-23
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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