Cavity Aeroacoustics Control: Several active and passive techniques are being studied for the control of the aeroacoustic environment surrounding cavities. Some of the passive techniques include such as spoilers, rods and steady fluid injection. Some of the active techniques include pulsed injection and high frequency acutation. The CRAFT CFD flow solver contains the latest in advanced turbulence modeling technology to simulate turbulent flows over complex geometries both efficiently and accurately. The majority of turbulent flow simulation is accomplished using a modified two-equation k-epsilon model. Advancements to the model include an improved compressibility correction and a new compressible vortex stretching method. These advancements have led to better prediction of straight back plume flows. For more complex anisotropic turbulent flows, especially those dealing with jet-noise, an Explicit Algebraic Stress Model is available. This model has also been modified to include additional compressibility effects to more accurately predict straight back plume flow fields.
