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EFFECT OF WALL DISTANCE COORDINATE ON THE PREDICTION OF VARIABLE PROPERTY FLOW WITH TWO-EQUATION TURBULENCE MODELS

Seong Gu Baek
Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, (371-1 Kusong-Dong, Yusong-Gu, Daejeon, Korea 305-701)

Seung O Park
Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, (371-1 Kusong-Dong, Yusong-Gu, Daejeon, Korea 305-701)

Abstract

This paper investigates the effect of wall distance coordinate on predicting variable property flows with two-equation turbulence models. Three of five different definitions of wall distance coordinate are employed: the wall-property definition, the integral-property definition, and the local-property definition. Three different two-equation turbulence models that involve the wall distance coordinate are tested against the property varying flow: superheated gas flow. The definition of wall distance coordinate affects the size of the viscous region. The wall-property based wall unit makes the viscous region the smallest and contributes to widen the damping region, so that the skin friction factor and the Nusselt number is lowered. All the predictions with three different wall distance coordinates are less than 10% in the calculated Nusselt number.

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