WIST » Lehre » Computational Wind Engineering

Computational Wind Engineering

Module Coordinator:


Prof. Dr.-Ing. R. Höffer

Lecturer(s):


Dipl.-Ing. U. Winkelmann
Dr.-Ing. C. Kalender


Teaching format / class hours per week during the semester:


Lectures and exercises: 2h

Content:


This course introduces the details and guidelines for the application of CFD methods in the field of wind engineering. Relevant problems for practical applications and solution procedures are investigated. The theoretical background is taught in the obligatory Fluid Dynamics course while this course aims at the practical application of CFD methods on various wind engineering problems. In general, the steady state RANS approach and the time dependent LES approach are used. The lectures and exercises include all necessary steps of a CFD simulation ranging from the creation of the geometry of the problem to the assessment and presentation of the results. During the semester the commercial software package ANSYS CFX and the open source software OpenFOAM are used.
The following working steps are explained and tested out:

  • Generation of geometries and block structured grids and analysis of the influence of the quality of the mesh on the results of the simulation.

  • Generation of geometries and unstructured numerical grids in and analysis of the influence of the quality of the mesh on the results of the simulation.

  • Setting up simulations (Pre-Processing):
    - Choosing the right boundary conditions.
    - Choosing the correct turbulence models.
    - Deciding on the parameters of the finite volume method such as interpolation schemes for the convective term of the Navier-Stokes equation.
    - Adding source terms of exhaust for the investigation of pollution in the atmosphere.

  • Application of the numerical solvers for parallel processing.

  • Post processing of the most important characteristics of wind engineering flows and presenting them in an adequate manner:
    - Analysis of mean velocity vector fields around structures.
    - Analysis of mean and time dependent pressure distributions on the surface of structures that are exposed to wind to estimate the load due to wind.
    - Analysis of the aerodynamic forces of lift and drag.
    - Gaseous transport and dispersion in the atmospheric boundary layer for the prediction of the dispersion of exhausts and particles.
    - Validation and verification method.
    - Application of convergence criteria for LES.


Further information is given in the curriculum description, see "http://compeng.rub.de"

Literature:


CFD:
Ferziger and Perić (2002), Computational Methods for Fluid Dynamics, Berlin
Versteeg and Malalasekra (2009), An Introduction to Computational Fluid Dynamics – The Finite Volume Method, Essex.

OpenFOAM:
Maric et al (2014),The OpenFOAM technology Primer.
OpenFOAM User Guide.
ANSYS:
ANSYS ICEM User Manual.
ANSYS CFX Solver Theory Guide.
ANSYS CFX Solver Modeling Guide.
ANSYS CFX Pre User Guide.

Study/exam achievements:


To be announced.

Registration and lecture notes:


see “Computational Wind Engineering” course in "Moodle"