Numerical Simulation of Flow in the Reverberation Chamber Unit using Computational Fluid Dynamics

Three dimensional 'steady state, incompressible, viscous flow' is simulated for the reverberation chambers and its subsystems of New Acoustic Test Facility, under realization at ISITE campus, using Computational Fluid Dynamics (CFD) technique. The computational domain is taken from horn throat to the exhaust end of muffler duct unit and is discretised with hexahedral elements. Gaseous nitrogen is the fluid medium flowing at a rate of 8 kg/s. FLUENT 6.3, commercial general purpose CFD solver is used for the analysis. The Pressure field inside the reverberation chamber, fluid impinging velocity around the central 10 % region of the reverberation chamber enveloping the test specimen, flow fluctuations (vortex regions) in the exponential horns and its impact on the acoustic wave propagation and flow distribution in the muffler duct unit are studied.