Grid dependence in modelling stratified flow in terrestrial and oceanic waters

Mark Arthur Simanjuntak

Grid dependence in modelling stratified flow in terrestrial and oceanic waters

Mark Arthur Simanjuntak

Research output: Thesis › Doctoral Thesis

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Abstract

The thesis investigates the effect of grid resolution on numerical modelling of stratified flows, in particular on Internal waves and mixing. When a smooth underwater obstacle is approximated by stair steps, the steps' sparse discontinuities can artificially reflect internal waves. This effect is analogous to aliasing effect in discrete Fourier transform. A simple expression was proposed to gauge this effect. In modelling mixing induced by shear instability, Richardson number closures can underrepresent mixing to coarse vertical resolutions. A method was proposed for testing and alleviating this grid dependence.

Original language	English
Qualification	Doctor of Philosophy
Awarding Institution	The University of Western Australia
Supervisors/Advisors	Ghadouani, Anas, Supervisor Nakayama, Keisuke, Supervisor
Award date	8 Dec 2016
Publication status	Unpublished - 2016

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THESIS - DOCTOR OF PHILOSOPHY - SIMANJUNTAK Mark Arthur - 2016
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title = "Grid dependence in modelling stratified flow in terrestrial and oceanic waters",

abstract = "The thesis investigates the effect of grid resolution on numerical modelling of stratified flows, in particular on Internal waves and mixing. When a smooth underwater obstacle is approximated by stair steps, the steps' sparse discontinuities can artificially reflect internal waves. This effect is analogous to aliasing effect in discrete Fourier transform. A simple expression was proposed to gauge this effect. In modelling mixing induced by shear instability, Richardson number closures can underrepresent mixing to coarse vertical resolutions. A method was proposed for testing and alleviating this grid dependence. ",

keywords = "numerical model, Stratified flow, internal waves, turbulence, richardson number, grid dependence, mixing, analytical solution",

author = "Simanjuntak, {Mark Arthur}",

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TY - BOOK

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AU - Simanjuntak, Mark Arthur

PY - 2016

Y1 - 2016

N2 - The thesis investigates the effect of grid resolution on numerical modelling of stratified flows, in particular on Internal waves and mixing. When a smooth underwater obstacle is approximated by stair steps, the steps' sparse discontinuities can artificially reflect internal waves. This effect is analogous to aliasing effect in discrete Fourier transform. A simple expression was proposed to gauge this effect. In modelling mixing induced by shear instability, Richardson number closures can underrepresent mixing to coarse vertical resolutions. A method was proposed for testing and alleviating this grid dependence.

AB - The thesis investigates the effect of grid resolution on numerical modelling of stratified flows, in particular on Internal waves and mixing. When a smooth underwater obstacle is approximated by stair steps, the steps' sparse discontinuities can artificially reflect internal waves. This effect is analogous to aliasing effect in discrete Fourier transform. A simple expression was proposed to gauge this effect. In modelling mixing induced by shear instability, Richardson number closures can underrepresent mixing to coarse vertical resolutions. A method was proposed for testing and alleviating this grid dependence.

KW - numerical model

KW - Stratified flow

KW - internal waves

KW - turbulence

KW - richardson number

KW - grid dependence

KW - mixing

KW - analytical solution

M3 - Doctoral Thesis

ER -

Grid dependence in modelling stratified flow in terrestrial and oceanic waters

Abstract

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