On the limits of added-mass theory in separated flows and with varying initial conditions
On the limits of added-mass theory in separated flows and with varying initial conditions
It remains unclear to what extent inviscid added-mass theory accounts for the forces exerted on an accelerating body subjected to separated flow. In this study, reactant forces and velocity-field data are systematically acquired using experimental measurements and simulations of an accelerating circular flat plate. Cases accelerated from rest are compared to cases accelerated from a steady flow state. When the added-mass forces predicted by potential the- ory and the resistance forces associated with the instantaneous plate velocity are accounted for, the remaining (residual) forces comprise approximately 20% of the peak force, even at high accelerations. In addition, the com- puted residual forces during accelerations both from rest and steady-state cases yield good collapse with respect to one another, indicating that the total forces are not a strong function of the initial state of the wake. These results suggests that inviscid added-mass theory is inadequate to predict the full reactant force even in the ‘ideal’ condition of impulsive motion from rest.
Fernando, John N.
992e5807-04e9-4074-b476-e64cf9b2a91d
Weymouth, Gabriel
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
Rival, David E.
87169441-f569-46d8-8add-bbdbbdc70a01
1 February 2020
Fernando, John N.
992e5807-04e9-4074-b476-e64cf9b2a91d
Weymouth, Gabriel
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
Rival, David E.
87169441-f569-46d8-8add-bbdbbdc70a01
Fernando, John N., Weymouth, Gabriel and Rival, David E.
(2020)
On the limits of added-mass theory in separated flows and with varying initial conditions.
Journal of Fluids and Structures, 93, [102835].
(doi:10.1016/j.jfluidstructs.2019.102835).
Abstract
It remains unclear to what extent inviscid added-mass theory accounts for the forces exerted on an accelerating body subjected to separated flow. In this study, reactant forces and velocity-field data are systematically acquired using experimental measurements and simulations of an accelerating circular flat plate. Cases accelerated from rest are compared to cases accelerated from a steady flow state. When the added-mass forces predicted by potential the- ory and the resistance forces associated with the instantaneous plate velocity are accounted for, the remaining (residual) forces comprise approximately 20% of the peak force, even at high accelerations. In addition, the com- puted residual forces during accelerations both from rest and steady-state cases yield good collapse with respect to one another, indicating that the total forces are not a strong function of the initial state of the wake. These results suggests that inviscid added-mass theory is inadequate to predict the full reactant force even in the ‘ideal’ condition of impulsive motion from rest.
Text
Fernando2019
- Accepted Manuscript
Restricted to Repository staff only until 26 December 2020.
Request a copy
More information
Accepted/In Press date: 29 November 2019
e-pub ahead of print date: 26 December 2019
Published date: 1 February 2020
Identifiers
Local EPrints ID: 436274
URI: http://eprints.soton.ac.uk/id/eprint/436274
ISSN: 0889-9746
PURE UUID: 0754673c-9db4-40d3-9cdd-debe03116380
Catalogue record
Date deposited: 05 Dec 2019 17:30
Last modified: 27 Jan 2020 13:46
Export record
Altmetrics
Contributors
Author:
John N. Fernando
Author:
David E. Rival
University divisions
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
