CFX 5 turbulence benchmark

Bart Prast

Dear all,

we are currently looking with CFX 5 (5.4.1 & 5.5) to our turbulence modelling in high speed compressible internal flows with swirls. We use standard k-eps , RNG k-eps and Reynold stress models. We noticed that by default CFX 5 always uses a first order upwind schema to solve the eddy dissipation and turb. kinetic energy. Setting these to second order resulted in more dissipation (we use a full tet mesh with an inflation layer of prisms, y+ values are within the range 30-300). setting eddy dissipation to second order does not work (highly unstable code). setting turbulent kinetic energy, k, to second order gave different results (more dissipation in swirl and boundary layer). We are currently looking for benchmarks of turbulence models using CFX 5 with high speed internal flows (Re > 10E8). Any body who can help us? Did anybody use CFX 5 to simulate the DLR F4 wing/body drag prediction case (can be found at http://www.aiaa.org/tc/apa/dragpredw...d_Results.html)?

Regards,

Bart