189 citations · 464 across the 11 of their papers we have counts for
11 papers
An extension of Thwaites method for turbulent boundary layers
Rahul Agrawal, Sanjeeb T. Bose, Kevin P. Griffin +1
Thwaites (1949) developed an approximate method for determining the evolution of laminar boundary layers. The approximation follows from an assumption that the growth of a laminar…
Near-wall model for compressible turbulent boundary layers based on an inverse velocity transformation
Kevin Patrick Griffin, Lin Fu, Parviz Moin
In this work, a near-wall model, which couples the inverse of a recently developed compressible velocity transformation [Griffin, Fu, & Moin, PNAS, 118:34, 2021] and an algebraic t…
Wall-modeled large-eddy simulation based on building-block flows
Yuenong Ling, Gonzalo Arranz, Emily Williams +3
A unified subgrid-scale (SGS) and wall model for large-eddy simulation (LES) is proposed by devising the flow as a collection of building blocks that enables the prediction of the…
Multi-agent reinforcement learning for wall modeling in LES of flow over periodic hills
Di Zhou, Michael P. Whitmore, Kevin P. Griffin +1
We develop a wall model for large-eddy simulation (LES) that takes into account various pressure-gradient effects using multi-agent reinforcement learning (MARL). The model is trai…
Compressible Velocity Transformations for Various Noncanonical Wall-Bounded Turbulent Flows
Tianyi Bai, Kevin P. Griffin, Lin Fu
This work assesses several popular transformations for the velocity profile through their application to several types of non-canonical compressible wall-bounded turbulent flows. S…
Non-Boussinesq subgrid-scale model with dynamic tensorial coefficients
Rahul Agrawal, Michael P. Whitmore, Kevin P. Griffin +2
A major drawback of Boussinesq-type subgrid-scale stress models used in large-eddy simulations is the inherent assumption of alignment between large-scale strain rates and filtered…
Velocity transformation for compressible wall-bounded turbulent flows with and without heat transfer
Kevin Patrick Griffin, Lin Fu, Parviz Moin
In this work, a transformation, which maps the mean velocity profiles of compressible wall-bounded turbulent flows to the incompressible law of the wall is proposed. Unlike existin…
A new ODE-based turbulence wall model accounting for pressure gradient and Reynolds number effects
Kevin Patrick Griffin, Lin Fu
In wall-modeled large-eddy simulations (WMLES), the near-wall model plays a significant role in predicting the skin friction, although the majority of the boundary layer is resolve…
Grid-point and time-step requirements for direct numerical simulation and large-eddy simulation
Xiang I. A. Yang, Kevin Patrick Griffin
We revisit the grid-point requirement estimates in Choi and Moin [Phys. Fluid, 24, 011702 (2012)] and establish more general grid-point requirements for direct numerical simulation…
General method for determining the boundary layer thickness in nonequilibrium flows
Kevin Patrick Griffin, Lin Fu, Parviz Moin
While the computation of the boundary-layer thickness is straightforward for canonical equilibrium flows, there are no established definitions for general non-equilibrium flows. In…
Control of long-range correlations in turbulence
Kevin P. Griffin, Nathaniel J. Wei, Eberhard Bodenschatz +1
The character of turbulence depends on where it develops. Turbulence near boundaries, for instance, is different than in a free stream. To elucidate the differences between flows,…