Numerical simulations of fluid flow
Title: Numerical simulations of fluid flow
SNIC Project: SNIC 2013/1-346
Project Type: SNAC Medium
Principal Investigator: Håkan Nilsson <hani@chalmers.se>
Affiliation: Chalmers tekniska högskola
Duration: 2014-01-01 – 2015-01-01
Classification: 20306
Keywords:

Abstract

In this project we will do highly resolved computational fluid dynamics simulations (CFD), using the OpenFOAM CFD tool. Since 2005, we have been part of the development and validation of this open source software. Now many of the functionalities that we need have been implemented and verified, and it is time to use them to produce high-quality results. For that we are using highly resolved DNS (Direct Numerical Simulation), LES (Large Eddy Simulation) and DES (Detached Eddy simulation) methods, and multiphase LPT (Lagrangian Particle Tracking) and VOF (Volume Of Fluid) methods, which require lots of computational resources. We are applying these methodologies to e.g.: 1: DES simulations of flow in the U9 Kaplan turbine model, with rotor-stator interaction through a sliding grid approach, at several operating conditions, and including clearance effects 2: LES and DES simulations of flow in the Timisoara Swirl Generator, with rotor-stator interaction through a sliding grid approach, at several operating conditions, and including clearance effects 3: Coupling between 1D system simulations and 3D VOF simulations with free surfaces, using an LES turbulence model closure 4: Unsteady RANS simulations of cooling air flow in electric generators, with rotor-stator interaction through an overlap sliding grid approach 5: LES simulations of flow in pipes and flow meters 6: Steady and unsteady RANS Simulations of a Francis turbine at several operating conditions, to study turbine damping of the rotor dynamics 7: DNS of channel flow with fibers