جستجوی مقالات مرتبط با کلیدواژه « Viscous Flow » در نشریات گروه « مکانیک »

This research explores and compares the AUSM scheme family based on compressible, steady, viscous, and inviscid axisymmetric flows in a finite-volume method-based and unstructured data storage grids code. When the effects of side-velocity are taken into account, axisymmetric flows can be considered a three-dimensional problem in the longitudinal plane; as a result, there is a considerably decreased number of computations required compared to computations in three dimensions. The most important and latest modifications of the AUSM-family were developed to identify more efficient methods in the AUSM- family in terms of accurate prediction of the axisymmetric flow field in internal and external axisymmetric flows, viscous (inviscid), and high-speed flows with shock waves characteristics. The novelty of this investigation is the assessment and comparison done on the AUSM-family in resolving the compressible axisymmetric flow field, which has received less attention in prior studies. The studies determined that the AUSM+M method performs better against a strong shock wave than other methods investigated in this research. According to the modifications made in this scheme, unlike other methods, there are no wiggles in the regions mentioned earlier. Furthermore, it is discovered that the AUSM+M method had a higher rate of convergence than the AUSM+ and SLAU approaches. In addition, the AUSM+M scheme is distinctive from other techniques in viscous flows because it produces the minimum kinetic energy dissipation rate and fewer shock anomalies in the shock wave region.

In this paper, the inviscid and viscous ultrasonic flow field of a steam turbine blade with Denton method is investigated. The novelty of this paper is, improving Denton's finite volume method by adding the turbulence viscous term on 2-D modeling. This is an area that better understanding can lead to improved design. The unsteady Navier - Stokes equations govern the overall behavior of compressible viscous flow and treated by the time marching scheme. For simulation in FORTRAN is used the finite volume method for discrete and Baldwin - Lomax model for the effects of turbulence in viscous flow. Independency of the number of grid points are obtained. Pressure distribution has been validated with experimental data and on the shock zone show good correlation and reduction of numerical errors with experimental data.

A turbulent supersonic flow over bodies of revolution, including the base flow, is investigated using multiblock grid to solve the thin layer Navier-Stokes (TLNS) equations. Patched method has been used near the interfaces. Our numerical scheme was implicit Beam-Warming centeral differencing, while Baldwin-Lomax turbulence modeling was used to close the Reynolds averaged Navier-Stokes equations. The results of this work have been compared with existing computational and experimental benchmark data and shows close agreements.