In the present study, we investigate evolution of turbulent statistics and coherent structures in hypersonic boundary layers at Mach number 5 impinged by oblique shock waves generated wedge with angles 14°, 10°, 6°, inducing strong, mild, incipient flow separation, exploiting direct numerical simulation databases, for purpose revealing underlying physics that are significance to modeling. We fo...

Computational modeling is an important tool to understand and stabilize transient turbulent fluid flow in the continuous casting of steel to minimize defects. The current work combines the predictions of two steady Reynolds-averaged Navier–Stokes (RANS) models, a ‘‘filtered’’ unsteady RANS model, and two large eddy simulation (LES) models with ultrasonic Doppler velocimetry (UDV) measurements i...

Deep learning (DL)-based Reynolds stress with its capability to leverage values of large data can be used to close Reynolds-averaged Navier-Stoke (RANS) equations. Type I and Type II machine learning (ML) frameworks are studied to investigate data and flow feature requirements while training DL-based Reynolds stress. The paper presents a method, flow features coverage mapping (FFCM), to quantif...

Numerical shape optimization for aerodynamic problems can lead to improved designs than what is possible by conventional methods. Gradient-based optimization methods require the development of adjoint codes which can be a lengthy exercise and is also not very mature for RANS-based approaches. Furthermore, they may lead to locally optimal solution only, which is not desirable, especially in a pr...

T h e covariance ma t r i x of a rotationally s y m m t r i c shape i s a scalar ident i ty ma t r i x . In this paper, w e apply this property of covariance m a t r i x t o deskew the skewed shape of rotational s y m m e t r y . T h e parameters of the deskew t rans format ion m a t r i x are solved by lett ing the covariance ma t r i x of t he t rans formed shape be equal t o a scalar ident i...

In this work, we present a hybrid solver coupling a high-order LES solver with Cartesian mesh and a RANS solver with body-fitting mesh. This hybrid solver is developed within a dual-mesh consistent hybrid framework, where LES and RANS simulations for the same flow are conducted simultaneously on different computational domains and different meshes. In the LES, an immersed boundary method with r...

Title of Thesis: FLUID AND PARTICLE DYNAMICS IN AN AEROSOL VIRTUAL IMPACTOR Marwan L. Charrouf, Master of Science, 2004 Thesis Directed by: Professor Richard V. Calabrese Department of Chemical Engineering The collection and characterization of chemical and biological aerosols is essential to many areas of particle research such as toxicological studies, pollutant sampling, and biohazard assess...

Film-cooling flows are characterized by a row of jets injected at an angle from the blade surface or endwalls into the heated crossflow. The resulting flowfield is quite complex, and accurate predictions of the flow and heat transfer have been difficult to obtain using traditional two-equation turbulence models employed with ReynoldsAveraged Navier–Stokes (RANS) solvers. Recently, a four-equati...

Abstract. Unstable atmospheric conditions are often observed during the daytime over land and for significant periods offshore hence relevant wake studies. A simple k–ε RANS turbulence model simulation of wind turbine wakes in unstable surface layer is presented, which based on Monin–Obukhov similarity theory (MOST). The parametrizes buoyant production turbulent kinetic energy (TKE) without use...

Large-Eddy Simulations (LES) of a gasoline spray, where the mixture was ignited rapidly during or after injection, were performed in comparison to previous experimental study with quantitative flame motion and soot formation data [SAE 2020-01-0291] an accompanying Reynolds-Averaged Navier–Stokes (RANS) simulation at same conditions. The present reveals major shortcomings common RANS combustion ...