Flow past circular cylinder

5C1213 CFD Project course

Erik Stålberg

Department of Mechanics

· 2D laminar vortex shedding

§ von Karman vortex street

Ex: “Singing” telephone wires

in a cross-wind.

Project description

· Flow past circular cylinder

§ Look up flow case in literature

§ Edit available systems of equations

§ Build solver

· Run solver with suitable choise of parameters

· Try different boundary conditions

§ Dirichlet and Neumann types

· For low Reynolds number: trigger the symmetric wake to be unstable

Software

· Mesh generation – Gambit

§ Included in the Fluent package

· Solver: femLego (Dep. of Mech.)

§ Automated code generation

§ A single Maple file contains

§ System of equations

§ Boundary conditions

§ Initial conditions

§ The user can easily add or change any part of the code from Maple

§ Fortran code is compiled from the Maple file

· Post processing: OpenDX

The temperature field for flow past

a heated cylinder

Theodore von Karman (1881-1963)