Investigation of the interfacial instability in a non-Boussinesq density stratified flow using linear stability theory

The main goal of this study is investigating the interfacial instability in the shear density stratified flow in non-Boussinesq regime using linear stability theory. In the current study, the pseudospectral collocation method employed Chebyshev polynomials is applied to solve two coupled eigenvalue...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Ehsan Khavasi, Pouriya Amini, Javad Rahimi, Mohammad Hadi Mohammadi
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2019
Materias:	interfacial instability linear stability analysis stratified shear flows non-boussinesq Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/5e8e6690f8794987a1cfe916c2c7ac0c
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:5e8e6690f8794987a1cfe916c2c7ac0c
record_format	dspace
spelling	oai:doaj.org-article:5e8e6690f8794987a1cfe916c2c7ac0c2021-11-04T15:51:56ZInvestigation of the interfacial instability in a non-Boussinesq density stratified flow using linear stability theory2331-191610.1080/23311916.2019.1661590https://doaj.org/article/5e8e6690f8794987a1cfe916c2c7ac0c2019-01-01T00:00:00Zhttp://dx.doi.org/10.1080/23311916.2019.1661590https://doaj.org/toc/2331-1916The main goal of this study is investigating the interfacial instability in the shear density stratified flow in non-Boussinesq regime using linear stability theory. In the current study, the pseudospectral collocation method employed Chebyshev polynomials is applied to solve two coupled eigenvalue equations. Using the linear stability analysis in the temporal framework, the effects of various parameters on the flow instability have been studied. Obtained results in the present paper are showing that increasing the bed slope, the flow becomes more unstable; also at R = 1, Kelvin–Helmholtz and Holmboe waves appear. Furthermore, Holmboe waves were not observed only at θ = 0. This study shows that at R ≠ 1, in addition to observing Kelvin–Helmholtz and Holmboe waves with higher growth rates, by increasing the bed slope, the growth rate and the number of Kelvin–Helmholtz modes increase. With an improved understanding of the instability mechanisms and features with including the non-Boussinesq effects, one can confirm some of the previous experimental results and offer new indications to observations that have not been fully explained. In designing laboratory experiments to observe Holmboe waves and estimating their wavelengths and phase speeds the results of present paper are also could be useful.Ehsan KhavasiPouriya AminiJavad RahimiMohammad Hadi MohammadiTaylor & Francis Grouparticleinterfacial instabilitylinear stability analysisstratified shear flowsnon-boussinesqEngineering (General). Civil engineering (General)TA1-2040ENCogent Engineering, Vol 6, Iss 1 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	interfacial instability linear stability analysis stratified shear flows non-boussinesq Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	interfacial instability linear stability analysis stratified shear flows non-boussinesq Engineering (General). Civil engineering (General) TA1-2040 Ehsan Khavasi Pouriya Amini Javad Rahimi Mohammad Hadi Mohammadi Investigation of the interfacial instability in a non-Boussinesq density stratified flow using linear stability theory
description	The main goal of this study is investigating the interfacial instability in the shear density stratified flow in non-Boussinesq regime using linear stability theory. In the current study, the pseudospectral collocation method employed Chebyshev polynomials is applied to solve two coupled eigenvalue equations. Using the linear stability analysis in the temporal framework, the effects of various parameters on the flow instability have been studied. Obtained results in the present paper are showing that increasing the bed slope, the flow becomes more unstable; also at R = 1, Kelvin–Helmholtz and Holmboe waves appear. Furthermore, Holmboe waves were not observed only at θ = 0. This study shows that at R ≠ 1, in addition to observing Kelvin–Helmholtz and Holmboe waves with higher growth rates, by increasing the bed slope, the growth rate and the number of Kelvin–Helmholtz modes increase. With an improved understanding of the instability mechanisms and features with including the non-Boussinesq effects, one can confirm some of the previous experimental results and offer new indications to observations that have not been fully explained. In designing laboratory experiments to observe Holmboe waves and estimating their wavelengths and phase speeds the results of present paper are also could be useful.
format	article
author	Ehsan Khavasi Pouriya Amini Javad Rahimi Mohammad Hadi Mohammadi
author_facet	Ehsan Khavasi Pouriya Amini Javad Rahimi Mohammad Hadi Mohammadi
author_sort	Ehsan Khavasi
title	Investigation of the interfacial instability in a non-Boussinesq density stratified flow using linear stability theory
title_short	Investigation of the interfacial instability in a non-Boussinesq density stratified flow using linear stability theory
title_full	Investigation of the interfacial instability in a non-Boussinesq density stratified flow using linear stability theory
title_fullStr	Investigation of the interfacial instability in a non-Boussinesq density stratified flow using linear stability theory
title_full_unstemmed	Investigation of the interfacial instability in a non-Boussinesq density stratified flow using linear stability theory
title_sort	investigation of the interfacial instability in a non-boussinesq density stratified flow using linear stability theory
publisher	Taylor & Francis Group
publishDate	2019
url	https://doaj.org/article/5e8e6690f8794987a1cfe916c2c7ac0c
work_keys_str_mv	AT ehsankhavasi investigationoftheinterfacialinstabilityinanonboussinesqdensitystratifiedflowusinglinearstabilitytheory AT pouriyaamini investigationoftheinterfacialinstabilityinanonboussinesqdensitystratifiedflowusinglinearstabilitytheory AT javadrahimi investigationoftheinterfacialinstabilityinanonboussinesqdensitystratifiedflowusinglinearstabilitytheory AT mohammadhadimohammadi investigationoftheinterfacialinstabilityinanonboussinesqdensitystratifiedflowusinglinearstabilitytheory
_version_	1718444651688493056

Investigation of the interfacial instability in a non-Boussinesq density stratified flow using linear stability theory

Ejemplares similares