3-DIMENSIONAL CALCULATIONS OF THE SIMPLE SHEAR-FLOW AROUND A SINGLE-PARTICLE BETWEEN 2 MOVING WALLS

Three-dimensional solutions have been obtained for the steady simple s hear flow over a spherical particle in the intermediate Reynolds numbe r range 0.1 less than or equal to Re less than or equal to 100. The sh ear flow was generated by two walls which move at the same speed but i n opposite directions, and the particle was located in the middle of t he gap between the walls. The particle-wall interaction is treated by introducing a fully three-dimensional Chimera or overset grid scheme. The Chimera grid scheme allows each component of a flow to be accurate ly and efficiently treated. For low Reynolds numbers and without any w all influence we have verified the solution of Taylor (1932) for the s hear around a rigid sphere. With increasing Reynolds numbers the angul ar velocity for zero moment for the sphere decreases with increasing R eynolds number. The influence of the wall has been quantified with the global particle surface characteristics such as net torque and Nussel t number. A detailed analysis of the influence of the wall distance an d Reynolds number on the surface distributions of pressure, shear stre ss and heat transfer has also been carried out.