Colloquium Mathematics, Roel Verstappen

Join us for coffee and tea at 15.30 p.m.

Date:                         Tuesday, October 15^th 2013
Speaker:                   Roel Verstappen
Room:                        5161.0293 (Bernoulliborg)
Time:                         16.00

Title: Models for the larger eddies in turbulent flow

Abstract:

Most turbulent flows cannot be computed directly from the Navier-Stokes equations, because they possess far too many scales of motion. Therefore numerical simulations of turbulent flow have to resort to models of the small scales for which numerical resolution is not available. At the crossroads of theory and simulation new  models start to develop. Basically there are two types of models: (1) regularization models that directly alter the nonlinearity to counter the production of small scales of motion and (2) dissipative models that effectively increase the viscosity to restrain (damp) the smallest scales. In this talk, both types are discussed and it is proposed to blend them. The blend  is successfully tested for turbulent channel flows.

Colloquium coordinators are Prof.dr. A.C.D. van Enter (e-mail : A.C.D.van.Enter@rug.nl) and

Dr. A.V. Kiselev (e-mail: a.v.kiselev@rug.nl )

http://www.rug.nl/research/jbi/news/colloquia/mathematics-colloquia/