Collisional Granular Flow Around an Immersed Cylinder
Abstract
A twodimensional collisional granular flow past an immersed cylinder is investigated using discrete element computer simulations. The drag force acting on the cylinder, F_{d}, is proportional to the upstream bulk density, rho nu_{infinity}, where rho is the upstream particle mass density and nu is the upstream solid fraction, the square of the upstream velocity, U_{infinity}, and the sum of the cylinder diameter, D, and surrounding particle diameter, d. The drag coefficient, defined as C_{d}=(2F_{d})(rho nu_{infinity}U_{infinity}^{2}D+d has a strong dependence on the flow Knudsen number and a secondary weak dependence on the Mach number. The drag coefficient decreases slightly with decreasing coefficient of restitution and is relatively insensitive to the interparticle friction coefficient. Bow shock structures and expansion fans similar to those observed in compressible fluid flows are also observed.
 Publication:

Sixth Microgravity Fluid Physics and Transport Phenomena Conference: Exposition Topical Areas 16, vol. 2
 Pub Date:
 November 2002
 Bibcode:
 2002mfpt....2..263W
 Keywords:

 Fluid Flow;
 Fluid Dynamics;
 Computerized Simulation;
 Aerodynamic Drag;
 Particle Mass;
 Cylinders;
 Aerodynamic Coefficients;
 Mach Number;
 Shock Waves;
 Fluid Mechanics and Thermodynamics