A new-generation wall modeling approach for LES of non-equilibrium turbulent wall-bounded flows
Abstract
SOW A new wall modeling approach for Large Eddy Simulation (LES) will be developed and testedon various turbulent wall-bounded flows. The approach is based on a recent theoreticaldevelopment that arose as part of the soon-to-finish ONR project (N00014-17-1-2937). It enablesus to rigorously separate quasi-equilibrium and non-equilibrium timescales in the relationshipbetween wall stress and the LES-resolved flow away from the wall. The slow part takes the formof a temporal relaxation equation while the rapid part is based on a relationship between wallstress and backward temporal convolution derived from a generalized viscous Stokes problem.As part of the proposed two-year project, the wall model theory and formulation will becompleted and the model applied to wall-bounded flows of increasing complexity: channel flowsubjected to time-varying streamwise pressure gradients (step function, ramp, oscillatory), timevaryingspanwise pressure gradient (step function, ramp, oscillatory), as well as to a spatiallydeveloping boundary later with suction and blowing, including a separation bubble, at very highReynolds numbers. Together with the machine-learning based transition wall-modeling approachdeveloped in the recent ONR project, this project aims to culminate with a theoretically rigorousand practically robust wall model that can be applied to LES across various flow regimes, inparticular to strongly non-equilibrium flows including separated regions.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 02, 2021
- Source ID
- N000142112162
Entities
People
- Charles Meneveau
Organizations
- Johns Hopkins University
- Office of Naval Research
- United States Navy