Record Details

Evaluation of Assumed-Transition-Point Criterion in Context of Reynolds-Averaged Simulations Around Lighter-Than-Air Vehicles

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Evaluation of Assumed-Transition-Point Criterion in Context of Reynolds-Averaged Simulations Around Lighter-Than-Air Vehicles
 
Creator SUMAN, S
LAKSHMIPATHY, S
PANT, RS
 
Subject SHAPE OPTIMIZATION
AIRSHIP BODIES
 
Description In this work, the performance of the assumed-transition-point criterion, in conjunction with Reynolds-averaged Navier Stokes simulations is evaluated over the hull of a lighter-than-air vehicle. The evaluation is performed by comparing the Reynolds-averaged Navier Stokes computations of drag, lift, and moment coefficients against those measured in experiments where 1) transition is forced to occur (forced-transition case) and 2) transition is allowed to occur naturally (free-transition case). It was found that by using the assumed-transition-point criterion Reynolds-averaged Navier Stokes computations satisfactorily recover the drag coefficient both at zero angle of attack and nonzero angles of attack up to five degrees when compared against the forced-transition case. However, irrespective of the location of the assumed transition point, Reynolds-averaged Navier Stokes fails to recover the experimentally observed values of the force and moment coefficients for the free-transition case. At this point, it is not clear if this failure is attributable to the assumed-transition-point criterion or to the Reynolds-averaged Navier Stokes framework itself. A similar systematic evaluation with more scale resolving computational fluid dynamics methods (large eddy simulation or bridging methods) may be helpful in ascertaining the reason of this failure.
 
Publisher AMER INST AERONAUTICS ASTRONAUTICS
 
Date 2014-10-14T17:21:36Z
2014-10-14T17:21:36Z
2013
 
Type Article; Proceedings Paper
 
Identifier JOURNAL OF AIRCRAFT, 50(2)450-456
http://dx.doi.org/10.2514/1.C031880
http://dspace.library.iitb.ac.in/jspui/handle/100/14555
 
Language en