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Nonlinear acoustic pulse propagation...

Maestas, Joseph T.

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Nonlinear acoustic pulse propagation in range-dependent underwater environments.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Nonlinear acoustic pulse propagation in range-dependent underwater environments./
作者:	Maestas, Joseph T.
面頁冊數:	72 p.
附註:	Source: Masters Abstracts International, Volume: 51-06.
Contained By:	Masters Abstracts International51-06(E).
標題:	Acoustics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1537791
ISBN:	9781303096563

Nonlinear acoustic pulse propagation in range-dependent underwater environments.
Maestas, Joseph T.

Nonlinear acoustic pulse propagation in range-dependent underwater environments. - 72 p.

Source: Masters Abstracts International, Volume: 51-06.

Thesis (M.S.)--Colorado School of Mines, 2013.

This item is not available from ProQuest Dissertations & Theses.

The nonlinear progressive wave equation (NPE) is a time-domain formulation of Euler's fluid equations designed to model low angle wave propagation using a wave-following computational domain. The standard formulation consists of four separate mathematical quantities that physically represent refraction, nonlinear steepening, radial spreading, and diffraction. The latter two of these effects are linear whereas the steepening and refraction are nonlinear. This formulation recasts pressure, density, and velocity into a single variable - a dimensionless pressure perturbation - which allows for greater efficiency in calculations. The wave-following frame of reference permits the simulation of long-range propagation that is useful in modeling the effects of blast waves in the ocean waveguide. Nonlinear effects such as weak shock formation are accurately captured with the NPE. The numerical implementation is a combination of two numerical schemes: a finite-difference Crank-Nicholson algorithm for the linear terms of the NPE and a flux-corrected transport algorithm for the nonlinear terms. In this work, an existing implementation is extended to allow for a penetrable fluid bottom. Range-dependent environments, characterized by sloping bathymetry, are investigated and benchmarked using a rotated coordinate system approach.

ISBN: 9781303096563Subjects--Topical Terms:

879105
Acoustics.

Nonlinear acoustic pulse propagation in range-dependent underwater environments.
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245 1 0 $a Nonlinear acoustic pulse propagation in range-dependent underwater environments.
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500 $a Advisers: Jon M. Collis; John R. Berger.
502 $a Thesis (M.S.)--Colorado School of Mines, 2013.
506 $a This item is not available from ProQuest Dissertations & Theses.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a The nonlinear progressive wave equation (NPE) is a time-domain formulation of Euler's fluid equations designed to model low angle wave propagation using a wave-following computational domain. The standard formulation consists of four separate mathematical quantities that physically represent refraction, nonlinear steepening, radial spreading, and diffraction. The latter two of these effects are linear whereas the steepening and refraction are nonlinear. This formulation recasts pressure, density, and velocity into a single variable - a dimensionless pressure perturbation - which allows for greater efficiency in calculations. The wave-following frame of reference permits the simulation of long-range propagation that is useful in modeling the effects of blast waves in the ocean waveguide. Nonlinear effects such as weak shock formation are accurately captured with the NPE. The numerical implementation is a combination of two numerical schemes: a finite-difference Crank-Nicholson algorithm for the linear terms of the NPE and a flux-corrected transport algorithm for the nonlinear terms. In this work, an existing implementation is extended to allow for a penetrable fluid bottom. Range-dependent environments, characterized by sloping bathymetry, are investigated and benchmarked using a rotated coordinate system approach.
590 $a School code: 0052.
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650 4 $a Ocean engineering. $3 660731
650 4 $a Applied mathematics. $3 2122814
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710 2 $a Colorado School of Mines. $b Mechanical Engineering. $3 2092097
773 0 $t Masters Abstracts International $g 51-06(E).
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