This paper represents the results of an experimental work with measurement of mean velocity along with total pressure contours in 2-D form and validation of the same with numerical results based on the wall y + approach for various turbulent models like, Spalart Alamras, k-ε model, k-ω model and RSM models are used to solve the closure problem. The turbulence models are investigated in the comm...

Abstract: Detached-eddy simulation (DES) based on the v-f Reynolds-averaged Navier-Stokes (RANS) model is developed and tested. The v-f model incorporates the anisotropy of near-wall turbulence, which is absent in other RANS models commonly used in the DES community. The v-f RANS model is modi ed in order that the proposed v-f -based DES formulation reduces to a transport equation for the subgr...

The concept of a vertical-axis spiral wind rotor is proposed and implemented in the interest of adapting it to air flows from all directions and improving the rotor’s performance. A comparative study is performed between the proposed rotor and conventional Savonius rotor. Turbulent flow features near the rotor blades are simulated with Spalart-Allmaras turbulence model. The torque coefficient o...

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 ...

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...

Accurate simulation of turbulent flow with separation is an important but challenging problem. In this paper, a data-driven Reynolds-averaged turbulence modeling approach, field inversion and machine learning implemented to modify the Spalart–Allmaras model separately on three cases, namely, S809 airfoil, periodic hill GLC305 airfoil ice shape 944. Field based discrete adjoint method used quant...

This paper compares the results of well-known Spalart-Allmares (SA) model and two-fluid for flow around a heated flat plate. These models represent different approaches to problem turbulence. The SA is one-parameter representative RANS models. currently most popular used solve many practical problems. advantage this that its accuracy quite good simple numerical implementation. Therefore, includ...

In this paper, an adaptive mesh refinement technique is presented for simulation of compressible flows, which can effectively refine the in regions with shock waves and vortices. The present approach uses total energy per unit volume as indicator to capture vortical structures. approach, h-refinement strategy adopted. To save computational effort, flow variables on new are obtained from previou...

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. ...

in this work, harmony search meta-heuristic optimization algorithm has been developed for aerodynamic shape optimization problem for the first time. the aerodynamic shape, which has been investigated, is an airfoil with parces method for its shape parameterization. the problem was minimization of aerodynamic objective function using inverse design method and the objective function has been the ...