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Parallel DNS of electro-magnetic flo...

Du, Yiqing.

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Parallel DNS of electro-magnetic flow control.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Parallel DNS of electro-magnetic flow control./
作者:	Du, Yiqing.
面頁冊數:	198 p.
附註:	Source: Dissertation Abstracts International, Volume: 61-09, Section: B, page: 4800.
Contained By:	Dissertation Abstracts International61-09B.
標題:	Mathematics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9987749
ISBN:	9780599939219

Parallel DNS of electro-magnetic flow control.
Du, Yiqing.

Parallel DNS of electro-magnetic flow control. - 198 p.

Source: Dissertation Abstracts International, Volume: 61-09, Section: B, page: 4800.

Thesis (Ph.D.)--Brown University, 2000.

The first part of this thesis deals with incompressible weakly conducting fluid such as sea water. It involves solving the Navier-Stokes equations with Lorentz force as an extra body force. The proper modeling of Lorentz force is investigated, and different electro-magnetic tile configurations are considered and several issues are addressed concerning boundary conditions; the Motz problem; edge effects; and substrate effects. After the validation of the mathematical formulation and simulation by comparing simulation results against experimental data with a single Lorentz force actuator, we perform DNS studies of turbulent channel flow with multi-tile configurations embedded in one channel wall.

ISBN: 9780599939219Subjects--Topical Terms:

515831
Mathematics.

Parallel DNS of electro-magnetic flow control.
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245 1 0 $a Parallel DNS of electro-magnetic flow control.
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500 $a Adviser: George Em Karniadakis.
502 $a Thesis (Ph.D.)--Brown University, 2000.
520 $a The first part of this thesis deals with incompressible weakly conducting fluid such as sea water. It involves solving the Navier-Stokes equations with Lorentz force as an extra body force. The proper modeling of Lorentz force is investigated, and different electro-magnetic tile configurations are considered and several issues are addressed concerning boundary conditions; the Motz problem; edge effects; and substrate effects. After the validation of the mathematical formulation and simulation by comparing simulation results against experimental data with a single Lorentz force actuator, we perform DNS studies of turbulent channel flow with multi-tile configurations embedded in one channel wall.
520 $a Simulations of a specific multi-tile configuration and pulsing pattern proposed by researchers of Princeton University reveal a spanwise coherent structure resembling a traveling wave. To model this excitation, we impose a transverse traveling wave that decays exponentially in the wall normal direction in accord with the spanwise Lorentz force. Systematic simulations reveal that for certain combinations of frequency, wavelength and force magnitude, substantial (≥20%) drag reduction can be obtained. This is the first time that such result is obtained as it is based on a fundamental new mechanism not explored in the past.
520 $a The second part of this thesis considers a single-fluid-two-temperature model of a fully ionized plasma flow. We derive the governing equations and cast them into a conservative formulation. The problem is solved in a discontinuous Galerkin formulation. We adopt the characteristic approach which involves deriving an approximate Riemann solver. A convergence test is performed for a two-dimensional magnetohydrostatic problem. We also obtain some preliminary results for a two-temperature plasma flow past a cylinder.
520 $a We use spectral/hp element method in all the simulations carried out in this work. Both an old version of the code called PRISM (structured discretization) and the new version called N3kTar (unstructured discretization) are used in our simulations. For turbulence simulations, we use the parallel versions of both codes, leading to high resolution computation with high efficiency.
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