Error-estimate based adaptive mesh refinement: A user-independent approach for LES

Computational fluid dynamics (CFD) has become an indispensable tool in research and engineering. Even though the performance of computers is increasing at unfathomable speeds, the calculation of many fluid problems remains to be challenging. With the emerging widespread use of Large Eddy Simulation (LES), the computational cost of simulations...

CFD Study of Piston Cooling Using Oil Jets

For heavy duty diesel engines, piston temperature control is very important in constructing a successful design that meets the demands of increasing power output and stringent emission regulations. Overheating of piston is avoided with engine oil through spray cooling and gallery cooling processes. In this research project, evolution and...

Experimental Study of Shock-Shock Interactions with Variable Inflow Mach Number

An experimental investigation on shock-shock interactions has been conducted with the aim of studying the transition between Regular (RI) and Mach interactions (MI) under the condition of variable inflow Mach number. The RI contains only oblique shocks while the MI has a quasi-normal shock segment, known as the Mach stem. MI configurations...

A study of an artificial viscosity technique for high-order discontinuous Galerkin methods

Prediction of heat loads during hypersonic re-entry is of great interest in space exploration and in the topic of space debris as well. To date, there is no accurate method to reproduce either experimentally or numerically the physics in re-entry conditions. On the numerical side, high-order discontinuous Galerkin methods have potential to...

Development of a transient CFD methodology for the optimization of CNG engines

Compressed natural gas (CNG) has been gaining attention in the automotive industry since it allows for a substantial reduction in carbon dioxide emissions. Recent advancements in direct-injection technology have contributed to an increase in volumetric efficiency and engine power, but the physical modeling of such gaseous injection with...

Validatable Shock-Wave/Turbulent Boundary-Layer Interaction over a Compliant Panel

Shock-Wave/Turbulent-Boundary Layer Interactions (SWTBLI) often occur in applications of technological interest. The associated inherent low-frequency unsteadiness dictates the use of Large-Eddy Simulation (LES) approaches to resolve the interaction, which unavoidably implies a very high computational cost. For this reason, no well-resolved long...

Multi-fidelity Co-Kriging Optimization using Hybrid Injected RANS and LES

The computation of complex turbulent flows design optimization processes is currently limited by the lack of accuracy of Reynolds-Averaged Navier-Stokes (RANS) in massively separated flows and the infeasible cost of multiple Large-Eddy Simulation (LES) evaluations. A novel method is presented, injecting data from LES or other high-fidelity...

Computational Noise Prediction using LES and the Kirchhoff Method

The multi purpose CFD solver INCA is currently used for ow calculations on a variety of industrial and research projects. Supporting multiple discretization schemes in space and time, many engineering problems can be solved including turbulence, transition, multi-phase systems, combustion, cavitation and supersonic effects. The objective of the...

A Finite Element Method with Special Edge-Polynomials for Advection Problems

The field of Computational Fluid Dynamics (CFD) is constantly finding new ways to improve simulation results. One of the large challenges in CFD, is advection. Advection dominated flows are governed by hyperbolic equations, which pose severe stability issues. Stabilized methods usually add significant numerical diffusion, which alters the...

Aeroacoustic investigation of a stridor patient’s upper respiratory system: A Lattice Boltzmann Method simulation using Exa PowerFLOW

Children and adults suffering from Upper Airway Obstructions (UAOs) are nowadays examined using an invasive endoscopy. Because this diagnostic technique unavoidably exposes the patient to certain health risks, there exists a clear need for a non-intrusive diagnostic tool. Several research programs have been initiated that aim at the development...

Linear aeroacoustic solver in OpenFOAM

Due to rapid advances in computer technology the field of computational aeroacoustics has become an alternative to empirical and experimental methods for the prediction of sound production and propagation. However, in order to provide numerical aeroacoustic predictions for realistic applications a hybrid approach is still often the only option....