Computational Fluid Dynamics Laboratory


We are developing a new incompressible Navier-Stokes large-eddy simulation (LES) CFD code based on high-order WENO-based finite-difference methods, advanced subgrid-scale (SGS) turbulence models, and the fictitious domain approach for complex geometries. Two versions of the code are currently under development. The first WenoHemo is focusing on hemodynamics and the second WenoHydro focusing on fundamental and applied fluid flows including applications to fluid power. Some recent examples of the codes ability to handle turbulent flow in complex geometries are shown below. A manuscript on the LES of the cubic lid-driven cavity reporting validation of the SGS turbulence model has been accepted for publication to Journal of Computational Physics. A manuscript on the 2D lid-driven cavity flow with rotation (studying bifurcation and chaos) has been submitted to the journal Computers and Fluids. Manuscripts on the application of the code to some of the complex geometries shown below are also under preparation. Current code developments involve inclusion of a combustion model and a cavitation model to enable additional studies with an even broader scope. Inclusion of two-way fluid-structure interactions capabilities are also planned. The first two figures below are 2D cases and the rest are 3D LES. The 3D flow pictures show isosurfaces of vortical structures as detected using the lambda2 criterion of Jeong and Hussain (1995). A compressible version featuring the use of a newly developed version of the ESWENO scheme is also under development. Applications to benchmark cases and supersonic reacting shear layers are described in a recently submitted manuscript. Extensions to more complex geometries using a multiblock approach are underway with initial focus on high-speed boundary layer transition.