Welcome to CRAFT-Tech

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 flowfields. Please see figures below .


Constant Y/D cross-section through vortex core pitot probe values using baseline k-epsilon and EASM/J models.	Comparison of baseline k-epsilon and EASM/J predicted pitot probe contours at X/D = 11.5 cross-section.

Papp, J.L., Kenzakowski, D.C., and Dash, S.M., “Calibration and Validation of EASM Turbulence Model for Jet Flowfields,” Paper No. AIAA-2002-0855, 40th AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, January 14-17, 2002.

Papp, J.L. and Dash, S.M., “Hypersonic Transitional Modeling for Scramjet and Missile Applications,” Paper No. AIAA 2002-0155, 40th AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, January 14-17, 2002.