CALCULATION OF TURBULENT FLOWS WITH PRESSURE GRADIENTS USING A - MODEL

A - turbulence model is developed to calculate wall turbulent shear flows under various pressure gradient conditions. The dissipation rate of turbulent energy at a wall is set equal to zero, though the wall limiting behaviour of velocity fluctuations is reproduced exactly. Thus, the model assures computational expediency and convergence. The proposed model is constructed to properly take into account the effect of pressure gradients on shear layers. It was found by Nagano, Tagawa and Tsuji (1992), that in adverse pressure gradient flows the Van Driest constant decreased with increasing dimensionless pressure gradient parameter P+. Therefore, the developed model incorporates the modified Van Driest dumping function which is a function of P+. The validity of the proposed model was tested by application to a turbulent channel flow and boundary layers with P+<0, P+>0. The model predictions indicate that agreement with the experiment and the direct simulation data is very good over a wide range of pressure variations.

• Supplemental Notes:
  • JSME Intl J, Series B, v 38 n 4, Nov 1995, p 518 [7 p, 18 ref, 2 tab, 11 fig]
• Authors:
  • Hattori, H
  • Nagano, Y
• Publication Date: 1995

Language

• English

Subject/Index Terms

• TRT Terms: Atmospheric pressure; Flow; Fluid dynamics; Turbulence
• Candidate Terms: Turbulent flow
• Uncontrolled Terms: Pressure gradients
• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00719000
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Mar 27 1996 12:00AM