A NEW TURBULENCE MODEL FOR NEAR-WALL NATURAL-CONVECTION

Current turbulence models for simulating natural convection require to o much computation time or do not give sufficiently accurate results. A one-equation near-wall model is developed that incorporates the use of direct numerical simulation data (Ru = 5.4 x 10(5)) to remedy these shortcomings. The use of this near-wall model along with the standard k-epsilon model for the outer-wall region, yields good predictions fo r mean flow and turbulence in natural convection and significantly red uces computational cost. (C) 1998 Elsevier Science Ltd. All rights res erved.