A spectral element—Fourier method (SEM) for Direct Numerical Simulation (DNS) of the turbulent flow of non-Newtonian fluids is described and the particular requirements for non-Newtonian rheology are discussed. The method is implemented in parallel using the MPI message passing kernel, and execution times scale somewhat less than linearly with the number of CPUs, however this is more than compe...

Abstract The vortex-dominated flow around the triple-delta wing ADS-NA2-W1 aircraft is investigated in order to achieve a better understanding of physics phenomena that occur over particularly at transonic speed condition. Both URANS and scale-resolving DDES have been employed explore range suitability current CFD methods. Spalart–Allmaras One-Equation Model with corrections for negative turbul...

Galloping is a typical wind-induced phenomenon in iced conductors, which can have serious impacts on the safe and stable operation of power systems. The aerodynamic characteristics an conductor are key factor study galloping, be determined mainly by numerical simulation flow past conductor. Based Reynolds-averaged Navier-Stokes (RANS) equations closed Spalart-Allmaras (S-A) turbulence model, th...

This study presents an extension of a previous (On Exact Step Length in Gradient-Based Aerodynamic Shape Optimization) to viscous transonic flows. In this work, we showed that the same procedure derive explicit expression for exact step length βexact gradient-based optimization method inviscid flows can be employed The extended numerical was evaluated over RAE 2822 airfoil at two common flow co...

Two axisymmetric shock-wave / boundary-layer interaction (SWBLI) cases are used to benchmark oneand two-equation Reynolds-averaged Navier-Stokes (RANS) turbulence models. This validation exercise was executed in the philosophy of the NASA Turbulence Modeling Resource and the AIAA Turbulence Model Benchmarking Working Group. Both SWBLI cases are from the experiments of Kussoy and Horstman for ax...

The effect of ambient turbulence intensity on the flow induced oscillations rigid circular cylinders with symmetric and asymmetric local stimulation is studied. Cylinders oscillate in one degree freedom transversely to a steady uniform flow. Two-dimensional unsteady Reynolds-Average Navier-Stokes equations Spalart-Allmaras model are used solve problem numerically. Three freestream values (0.2%,...

Large Eddy Simulation (LES) and Detached Eddy Simulation (DES) are applied to prediction and investigation of the ow around a sphere. DES is a hybrid approach in which the closure is a simple modi cation to the Spalart-Allmaras model, reducing to Reynolds-Averaged Navier-Stokes (RANS) in attached regions, and LES away from the wall . Calculations are performed at a Reynolds number, Re = 10, in ...

In this study, the aerodynamic analysis of Ahmed body which is generic automobile model performed to determine convenient turbulence and reduce drag coefficient by modifying shape model. For purpose, Computational Fluid Dynamics (CFD) carried out using different models that are Spalart-Allmaras, (Shear Stress Transport) SST k-ω, Standard k-ε, Realizable (Re-Normalisation Group) RNG k-ε models. ...

This paper highlights the results and comparison of flow topology investigation above unmanned combat aerial vehicle (UCAV) configuration, namely, multidisciplinary design configuration (MULDICON), with modified leading-edge profile at apex region from a sharp to blunt reduce complexity structure wing. It was found visualization that low angle attack, for instance, 10°, onset separation took pl...

O objetivo deste estudo foi análise numérica, via simulação realizado no ANSYS Fluent em um aerofólio de perfil NACA 4415 com variações ângulos ataque. Analisou-se a distribuição pressão e velocidade do fluido ao redor da estrutura, bem como os valores coeficientes arrasto sustentação. Por meio das equações modelo turbulência denominado Spalart-Allmaras possível encontrar as tensões turbulentas...