Search for dissertations about: "RANS turbulence models"
Showing result 6 - 10 of 41 swedish dissertations containing the words RANS turbulence models.
-
6. Assessment and Some Improvements of Hybrid RANS-LES Methods
Abstract : Motivated by numerical analysis of a shock/boundary-layer interacting (SBLI) flow in a duct, where some typical existing hybrid RANS-LES methods become awkward to give accurate predictions of the shock-induced corner separation bubble, a new hybrid RANS-LES method, has been proposed. The model is based on a low-Reynolds-number (LRN) $k-\omega$ RANS model, which is one of the few models that are capable of giving reasonable predictions for the SBLI flow in RANS computations. READ MORE
-
7. Computational fluid dynamics for dispersion calculation in urban surroundings
Abstract : Increased knowledge on dispersion processes in urban environment will enhance the ability in the society to handle events where releases of toxic substances can occur. Also, the ability to increase preparedness at locations where such events potentially can emerge. READ MORE
-
8. Analytical and Numerical Investigations of Steady and Unsteady Turbulent Swirling Flow in Diffusers
Abstract : Swirling flows are found in many technical applications, e.g. turbines, pumps, fans, compressors and combustors. The objective of the present work is to acquire an understanding of the physics of swirling flow in general and unsteady swirling flow in draft tubes of water turbines in particular. READ MORE
-
9. Subgrid-scale modelling for large-eddy simulation including scalar mixing in rotating turbulent shear flows
Abstract : The aim of the present study is to develop subgrid-scale models that are relevant for complex flows and combustion. A stochastic model based on a stochastic Smagorinsky constant with adjustable variance and time scale is proposed. READ MORE
-
10. Large Eddy Simulations of Separated Compressible Flows around Wing Sections
Abstract : This thesis concerns numerical calculations of compressible separated flows, with and without shocks, around wing sections using Large Eddy Simulations (LES). The considered geometries are the NACA 0012 wing section and the ONERA AT15A wing section. READ MORE