Full Reynolds Stress Modeling of High Reynolds Number Wall Bounded Flows Subject to Large Pressure Gradients
Abstract
A research program is offered to develop, calibrate, assess and apply Full Reynolds Stress Modeling (FRSM) to very high Reynolds number (Re_L = O10^8-10^9) wall-bounded flows of relevance to undersea platforms. The goal of this proposed effort is to develop newFRSM-based Reynolds Averaged Navier-Stokes (RANS) models that will perform well for flows over hydrodynamic bodies subject to a wide range of streamwise and spanwise pressure gradients, a venue that despite its extreme importance in the design and operation of these systems, challenges all RANS models to date. FRSMs carry the potential for capturing the physics of three-dimensional boundary layers, subject to favorable and adverse pressure gradients (FPGs, APGs), with a significantly better pedigree than the eddy viscosity models (EVMs) that are currently used nearly universally in these flows. FRSMs also inherently accommodate streamline curvature and history effects known to be of importance in undersea hull and control surface flows, especially at high angles-of-attack/incidence. Such improvements to APG predictions will lead directly to more accurate separation point predictions, and thereby to the shedding of vortical structures from the hull and control surfaces, and to lift/drag predictions and thereby maneuvering in design-time-frame RANS analysis. Finally, new generation FRSMs will greatly enhance vortical transport predictions (a well-established strength of FRSMs vs. EVMs) in regions where LES is intractable and/or in the context of subgrid-scale LES modeling within hybrid RANS-LES methods.This research will significantly benefit the DoD#s ability to predict undersea vehicle maneuvering, thereby enabling significantly improved safe operation and design. The RANS tools currently in use by the USN can be straightforwardly retrofitted with the developed SMCs, enabling a move towards far more accurate and efficient RANS analysis of undersea vehicle maneuvering at the Navy laboratories and ship-builders.Approved for Public Release.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Mar 08, 2024
- Source ID
- N000142412170
Entities
People
- Robert Francis Kunz
Organizations
- Office of Naval Research
- Pennsylvania State University
- United States Navy