In this paper, the continuous adjointmethod to compute shape sensitivities in aerodynamic designwith turbulence modeling is described and developed. The focus is on compressible flows described by the Reynolds-averaged Navier–Stokes equations and the classical Spalart–Allmaras model for turbulence. Turbulence modeling usually requires, in particular, computation of the distance to the surface. ...

This paper presents several test cases that were used to validate the implementation of two turbulence models in UNS3D code, an in-house code. The Shear Stress Transport model and Spalart–Allmaras model. These explored using numerical results generated by three computational fluid dynamics codes: NASA’s FUN3D CFL3D, UNS3D. Four considered: a flat plate case, airfoil near-wake, backward-facing s...

In this paper, a performance prediction method is proposed for the design of stratospheric propeller. The Spalart–Allmaras (S–A) model was used to calculate airfoil FX63, and polynomial fitting utilized establish database lift drag coefficient. A computational fluid dynamics (CFD) applied at different altitudes prove feasibility method. CFD results were compared with vortex theory prediction; r...

Abstract An algebraic (zero-equation) transition model is developed to capture multiple mechanisms. The newly devised parameterized using “flow-structure-adaptive” variables and coupled with the truncated Spalart-Allmaras (SA) turbulence model. intermittency factor γ relies on “local flow information” directly linked “vorticity-based production” term of SA Splitting into lower higher regimes “f...

aerodynamic simulation of apds projectile with and without sabot has been conducted here. due to less weight of apds projectile in comparison with the projectile, with the same caliber, apds projectile has higher muzzle velocity, longer range, high penetration capability, and higher impact velocity. simulation of flow around the sabot walls has been carried out in two opening degrees of zero an...

This work presents a comparative study of Unsteady Reynolds–Averaged Navier–Stokes (URANS), Detached Eddy Simulations (DES) and Delayed (DDES) turbulence modeling approaches by performing numerical investigation with the ANSYS-FLUENT software package on full-scale model Jetstream 31 aircraft. The lift drag coefficients obtained from different models are compared flight test data, wind tunnel da...