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15 mins
Going beyond eddy viscosity: Finding a minimal representation of subgrid-scale stresses in large-eddy simulation
Maurits Silvis, Roel Verstappen
Session: Large Eddy Simulation 1
Session starts: Thursday 27 August, 10:30
Presentation starts: 11:15
Room: Room E

Maurits Silvis (University of Groningen, The Netherlands)
Roel Verstappen (University of Groningen, The Netherlands)

In the current study we aim to go beyond the dissipative description of turbulent flows that is provided by eddy viscosity models for large-eddy simulation. As a starting point, we consider a general subgrid-scale model that is nonlinear in the velocity gradient. To reduce the number of degrees of freedom of the model, we propose a first-principles-based procedure to find a minimal representation of subgrid-scale stresses. Then, several criteria to determine the dependence of model coefficients on flow properties are detailed. Ultimately, this would lead to a better understanding of the role of different nonlinear model terms in the description of turbulent flows.