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Simulation of stratified flow over t...

Ding, Li.

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Simulation of stratified flow over three-dimensional topography.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Simulation of stratified flow over three-dimensional topography./
作者:	Ding, Li.
面頁冊數:	207 p.
附註:	Source: Dissertation Abstracts International, Volume: 63-04, Section: B, page: 2005.
Contained By:	Dissertation Abstracts International63-04B.
標題:	Environmental engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3052403
ISBN:	9780493667133

Simulation of stratified flow over three-dimensional topography.
Ding, Li.

Simulation of stratified flow over three-dimensional topography. - 207 p.

Source: Dissertation Abstracts International, Volume: 63-04, Section: B, page: 2005.

Thesis (Ph.D.)--Stanford University, 2002.

This item must not be sold to any third party vendors.

Large eddy simulation is employed to study the stratified flow over three-dimensional topography. Incompressible, time-dependent, three-dimensional and filtered Navier-Stokes equations are solved using a finite-volume method. The subgrid scale flow motions are modeled by a dynamic mixed model. The LES code is applied to the simulation of linearly stratified flow over a bell-shaped hill.

ISBN: 9780493667133Subjects--Topical Terms:

548583
Environmental engineering.

Simulation of stratified flow over three-dimensional topography.
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245 1 0 $a Simulation of stratified flow over three-dimensional topography.
300 $a 207 p.
500 $a Source: Dissertation Abstracts International, Volume: 63-04, Section: B, page: 2005.
500 $a Adviser: Robert L. Street.
502 $a Thesis (Ph.D.)--Stanford University, 2002.
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 Large eddy simulation is employed to study the stratified flow over three-dimensional topography. Incompressible, time-dependent, three-dimensional and filtered Navier-Stokes equations are solved using a finite-volume method. The subgrid scale flow motions are modeled by a dynamic mixed model. The LES code is applied to the simulation of linearly stratified flow over a bell-shaped hill.
520 $a The performance of the LES code has been investigated by comparing its predictions with those from a towing tank experiment. The simulation results are in good agreement with the experimental results. The height of the dividing streamline which separates the flow over the hill from the flow around the hill can be estimated by Sheppard's formula only because the energy loss due to friction/turbulence is balanced by energy provided by the pressure field. Drazin's theory can be used to predict the flow field when F < 0.4 if there is no wake region in the flow. Lee waves caused by the perturbation of the topography follow the linear theory reasonably.
520 $a The effects of hill geometry have been studied by varying steepness and width of the hill. The variation of the dividing-streamline height with hill geometry is the result of the change of the pressure field. Two wake structures have been found at the leeside of the hill when F < l. One has a constant wake width and the other is similar to the wake generated by the two-dimensional flow passing around cylindrical bodies with a cross section equivalent to that of the hill at each level. In the low Froude number case (F << 1), the wake structure is dominated by the latter structure due to strong stratification. In the high Froude number case (F &sim; 1), the tilting of baroclinically-generated vortices forms a pair of vertically-oriented vortices with an approximately constant wake width.
520 $a A scalar is released upstream at different heights. The major diffusion occurs when the plume approaches the hill due to the increasing shear. The distortion of streamlines by the hill has a great impact on the diffusion of the scalar.
590 $a School code: 0212.
650 4 $a Environmental engineering. $3 548583
650 4 $a Geophysics. $3 535228
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690 $a 0373
710 2 $a Stanford University. $3 754827
773 0 $t Dissertation Abstracts International $g 63-04B.
790 $a 0212
791 $a Ph.D.
792 $a 2002
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3052403