| Numerical Investigation of Serpentine Plasma Actuators for Separation Control at Low Reynolds Number |
Jun 2011 |
17 pages |
| Authors:
Mark Riherd; Subrata Roy; Miguel Visbal; FLORIDA UNIV GAINESVILLE DEPT OF MECHANICAL ENGINEERING
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 | Dielectric Barrier Discharge (DBD) plasma actuators with serpentine shaped electrodes cause a change in the operational behavior of the flow control mechanism relative to the standard linear actuator due to the introduction of fully three dimensional vortices. A parametric study is performed on a partially separated transitional flow over an SD7003 airfoil. This study examines the change in behavior as a function of geometric parameters, in particular the geometric amplitude ... |
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| Study of Transient and Unsteady Effects of Plasma Actuation in Transitional Flow over an SD7003 Airfoil |
JAN 2011 |
15 pages |
| Authors:
Mark Riherd; Subrata Roy; Don Rizzetta; Miguel Visbal; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIR/ AERONAUTICAL SCIENCES DIV/COMPUTATIONAL SCIENCES BRANCH
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| The short term transient and long term periodic unsteady effects of pulsed plasma actuation are studied using an unsteady, compressible Navier-Stokes solver for the case of a partially separated transitional flow over an SD7003 airfoil at 4 deg angle of attack and at Re=40,000. Forcing magnitude and its effect on the flow field is examined. Distinctly different behavior is observed parameters are adjusted. The unsteady simulations show that the actuators ... |
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| Advances in High-Fidelity Multi-Physics Simulation Techniques |
JAN 2008 |
56 pages |
| Authors:
Datta Gaitonde; Eswar Josyula; Miguel Visbal; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE
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| Efforts performed under this task to evolve a high-fidelity methodology for multi-physics applications in all speed regimes are summarized. Among the disciplines considered are fluid dynamics (turbulence, acoustics), electromagnetics, magnetogasdynamics, aero-structural interactions and thermo-chemical nonequilibrium. For high-order accuracy, a compact-difference based method is developed, supplemented by a filtering procedure to guarantee numerical stability in the presence of boundary truncation, stretching and non-linearity. The filter is also shown to be suitable ... |
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| High Fidelity Methods and Physics for UAV Flow Regimes |
Jun 2004 |
6 pages |
| Authors:
Reid Melville; Miguel Visbal; Raymond Gordnier; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE
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| Planned Air Force Unmanned Air Vehicles (UAVs) will be limited by highly nonlinear flow regimes, so an advanced simulation capability has been applied to this class of problems. The proposed paper will document several large-scale computational studies and efforts to validate and to extend the solver capability. |
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