Work

Nonlocality of the slip length operator for scalar and momentum transport in turbulent flow over superhydrophobic surfaces

Year: 2025

Type: article

Abstract: Simulation of superhydrophobic surfaces (SHS) commonly utilizes a slip length boundary condition, relating slip velocity to wall-normal velocity gradient. In the Stokes flow limit, this effect can be shown to only depend on local velocity gradients at the wall; at finite Reynolds numbers, we find that nonlocal effects emerge. We investigate both scalar and momentum transport using the macroscopic forcing method to construct nonlocal eddy diffusivity, eddy viscosity, and slip kernels for turbulent channel flow over pattern-resolved SHS. The importance of nonlocality in these operators is assessed using the Reynolds-averaged representations for mean scalar and velocity fields.

Source: Physical Review Fluids

DOI: 10.1103/physrevfluids.10.034607

Authors: Kimberly Liu, Ali Mani

Institution: Stanford University

Language: English

Topic: Fluid Dynamics and Turbulent Flows

Subfield: Computational Mechanics

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funder: Office of Naval Research

Awards: G197472775, G4720003262, G8876996369