Numerical Simulations of Linearly Stratified Flow Past Submerged Bodies
In this study, a methodology was presented to predict density stratified flows in the near-field of submerged bodies. The energy equation in temperature form was solved coupled with momentum and mass conservation equations. Linear stratification was achieved by the definition of the density as a fun...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Sciendo
2018-12-01
|
| Series: | Polish Maritime Research |
| Subjects: | |
| Online Access: | https://doi.org/10.2478/pomr-2018-0114 |
| _version_ | 1818584673108885504 |
|---|---|
| author | Ma Weizhuang Li Yunbo Ding Yong Hu Kaiye Lan Linxin |
| author_facet | Ma Weizhuang Li Yunbo Ding Yong Hu Kaiye Lan Linxin |
| author_sort | Ma Weizhuang |
| collection | DOAJ |
| description | In this study, a methodology was presented to predict density stratified flows in the near-field of submerged bodies. The energy equation in temperature form was solved coupled with momentum and mass conservation equations. Linear stratification was achieved by the definition of the density as a function of temperature. At first, verifications were performed for the stratified flows passing a submerged horizontal circular cylinder, showing excellent agreement with available experimental data. The ability of the method to cope with variable density was demonstrated. Different turbulence models were used for different Re numbers and flow states. Based on the numerical methods proposed in this paper, the stratified flow was studied for the real scale benchmark DAPRA Suboff submarine. The approach used the VOF method for tracing the free surface. Turbulence was implemented with a k − ω based Detached Eddy Simulation (DES) approach. The effects of submarine speed, depth and density gradient on the free surface wave pattern were quantitatively analyzed. It was shown that, with the increasing of the speed of the submarine, the wavelength and wave height of the free surface wave were gradually increasing. The wave height of the free surface wave was gradually reduced as the submarine’s depth increased. Relative to the speed and submarine depth, the changes of the gradient density gradient have negligible effects on the free surface wave field. |
| first_indexed | 2024-12-16T08:24:54Z |
| format | Article |
| id | doaj.art-7226ca39e0c5417b954d90f31814fb75 |
| institution | Directory Open Access Journal |
| issn | 2083-7429 |
| language | English |
| last_indexed | 2024-12-16T08:24:54Z |
| publishDate | 2018-12-01 |
| publisher | Sciendo |
| record_format | Article |
| series | Polish Maritime Research |
| spelling | doaj.art-7226ca39e0c5417b954d90f31814fb752022-12-21T22:38:01ZengSciendoPolish Maritime Research2083-74292018-12-0125s3687710.2478/pomr-2018-0114pomr-2018-0114Numerical Simulations of Linearly Stratified Flow Past Submerged BodiesMa Weizhuang0Li Yunbo1Ding Yong2Hu Kaiye3Lan Linxin4College of Shipbuilding Engineering, Harbin Engineering University,Harbin, ChinaCollege of Ocean Science and Engineering, Shanghai Maritime University,Shanghai, ChinaCollege of Shipbuilding Engineering, Harbin Engineering University,Harbin, ChinaCollege of Shipbuilding Engineering, Harbin Engineering University,Harbin, ChinaCollege of Shipbuilding Engineering, Harbin Engineering University,Harbin, ChinaIn this study, a methodology was presented to predict density stratified flows in the near-field of submerged bodies. The energy equation in temperature form was solved coupled with momentum and mass conservation equations. Linear stratification was achieved by the definition of the density as a function of temperature. At first, verifications were performed for the stratified flows passing a submerged horizontal circular cylinder, showing excellent agreement with available experimental data. The ability of the method to cope with variable density was demonstrated. Different turbulence models were used for different Re numbers and flow states. Based on the numerical methods proposed in this paper, the stratified flow was studied for the real scale benchmark DAPRA Suboff submarine. The approach used the VOF method for tracing the free surface. Turbulence was implemented with a k − ω based Detached Eddy Simulation (DES) approach. The effects of submarine speed, depth and density gradient on the free surface wave pattern were quantitatively analyzed. It was shown that, with the increasing of the speed of the submarine, the wavelength and wave height of the free surface wave were gradually increasing. The wave height of the free surface wave was gradually reduced as the submarine’s depth increased. Relative to the speed and submarine depth, the changes of the gradient density gradient have negligible effects on the free surface wave field.https://doi.org/10.2478/pomr-2018-0114stratified flowcircular cylinderinternal wavesuboffequation of state |
| spellingShingle | Ma Weizhuang Li Yunbo Ding Yong Hu Kaiye Lan Linxin Numerical Simulations of Linearly Stratified Flow Past Submerged Bodies Polish Maritime Research stratified flow circular cylinder internal wave suboff equation of state |
| title | Numerical Simulations of Linearly Stratified Flow Past Submerged Bodies |
| title_full | Numerical Simulations of Linearly Stratified Flow Past Submerged Bodies |
| title_fullStr | Numerical Simulations of Linearly Stratified Flow Past Submerged Bodies |
| title_full_unstemmed | Numerical Simulations of Linearly Stratified Flow Past Submerged Bodies |
| title_short | Numerical Simulations of Linearly Stratified Flow Past Submerged Bodies |
| title_sort | numerical simulations of linearly stratified flow past submerged bodies |
| topic | stratified flow circular cylinder internal wave suboff equation of state |
| url | https://doi.org/10.2478/pomr-2018-0114 |
| work_keys_str_mv | AT maweizhuang numericalsimulationsoflinearlystratifiedflowpastsubmergedbodies AT liyunbo numericalsimulationsoflinearlystratifiedflowpastsubmergedbodies AT dingyong numericalsimulationsoflinearlystratifiedflowpastsubmergedbodies AT hukaiye numericalsimulationsoflinearlystratifiedflowpastsubmergedbodies AT lanlinxin numericalsimulationsoflinearlystratifiedflowpastsubmergedbodies |