Influence of Cross Perturbations on Turbulent Kelvin–Helmholtz Instability
Kelvin–Helmholtz instability has been studied extensively in 2D. This study attempts to address the influence of turbulent flow and cross perturbation on the growth rate of the instability and the development of mixing layers in 3D by means of direct numerical simulation. Two perfect gases are consi...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-02-01
|
| Series: | Fluids |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2311-5521/9/3/52 |
| _version_ | 1797241030560448512 |
|---|---|
| author | Mae Sementilli Rozie Zangeneh James Chen |
| author_facet | Mae Sementilli Rozie Zangeneh James Chen |
| author_sort | Mae Sementilli |
| collection | DOAJ |
| description | Kelvin–Helmholtz instability has been studied extensively in 2D. This study attempts to address the influence of turbulent flow and cross perturbation on the growth rate of the instability and the development of mixing layers in 3D by means of direct numerical simulation. Two perfect gases are considered to be working fluids moving as opposite streams, inducing shear instability at the interface between the fluids and resulting in Kelvin–Helmholtz instability. The results show that cross perturbation affects the instability by increasing the amplitude growth while adding turbulence has almost no effect on the amplitude growth. Furthermore, by increasing the turbulence intensity, a more distinct presence of the inner flow can be seen in the mixing layer of the two phases, and the presence of turbulence expands the range of high-frequency motion significantly due to turbulence structures. The results give a basis for which 3D Kelvin–Helmholtz phenomena should be further investigated using numerical simulation for predictive modeling, beyond the use of simplified 2D theoretical models. |
| first_indexed | 2024-04-24T18:16:51Z |
| format | Article |
| id | doaj.art-5c140d665b4f47868f24b07bc857e968 |
| institution | Directory Open Access Journal |
| issn | 2311-5521 |
| language | English |
| last_indexed | 2024-04-24T18:16:51Z |
| publishDate | 2024-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fluids |
| spelling | doaj.art-5c140d665b4f47868f24b07bc857e9682024-03-27T13:38:21ZengMDPI AGFluids2311-55212024-02-01935210.3390/fluids9030052Influence of Cross Perturbations on Turbulent Kelvin–Helmholtz InstabilityMae Sementilli0Rozie Zangeneh1James Chen2Department of Mechanical and Aerospace Engineering, University at Buffalo, 240 Bell Hall, Buffalo, NY 14260, USADepartment of Mechanical and Aerospace Engineering, University at Buffalo, 240 Bell Hall, Buffalo, NY 14260, USADepartment of Mechanical and Aerospace Engineering, University at Buffalo, 240 Bell Hall, Buffalo, NY 14260, USAKelvin–Helmholtz instability has been studied extensively in 2D. This study attempts to address the influence of turbulent flow and cross perturbation on the growth rate of the instability and the development of mixing layers in 3D by means of direct numerical simulation. Two perfect gases are considered to be working fluids moving as opposite streams, inducing shear instability at the interface between the fluids and resulting in Kelvin–Helmholtz instability. The results show that cross perturbation affects the instability by increasing the amplitude growth while adding turbulence has almost no effect on the amplitude growth. Furthermore, by increasing the turbulence intensity, a more distinct presence of the inner flow can be seen in the mixing layer of the two phases, and the presence of turbulence expands the range of high-frequency motion significantly due to turbulence structures. The results give a basis for which 3D Kelvin–Helmholtz phenomena should be further investigated using numerical simulation for predictive modeling, beyond the use of simplified 2D theoretical models.https://www.mdpi.com/2311-5521/9/3/52Kelvin–Helmholtz Instabilityturbulencemixing |
| spellingShingle | Mae Sementilli Rozie Zangeneh James Chen Influence of Cross Perturbations on Turbulent Kelvin–Helmholtz Instability Fluids Kelvin–Helmholtz Instability turbulence mixing |
| title | Influence of Cross Perturbations on Turbulent Kelvin–Helmholtz Instability |
| title_full | Influence of Cross Perturbations on Turbulent Kelvin–Helmholtz Instability |
| title_fullStr | Influence of Cross Perturbations on Turbulent Kelvin–Helmholtz Instability |
| title_full_unstemmed | Influence of Cross Perturbations on Turbulent Kelvin–Helmholtz Instability |
| title_short | Influence of Cross Perturbations on Turbulent Kelvin–Helmholtz Instability |
| title_sort | influence of cross perturbations on turbulent kelvin helmholtz instability |
| topic | Kelvin–Helmholtz Instability turbulence mixing |
| url | https://www.mdpi.com/2311-5521/9/3/52 |
| work_keys_str_mv | AT maesementilli influenceofcrossperturbationsonturbulentkelvinhelmholtzinstability AT roziezangeneh influenceofcrossperturbationsonturbulentkelvinhelmholtzinstability AT jameschen influenceofcrossperturbationsonturbulentkelvinhelmholtzinstability |