First and Second Order Turbulence Closures Applied to Homogeneous Turbulent Bubbly Flows
| Autor: | Ghazi Bellakhal, F. Chaibina, Jamel Chahed |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Turbulence Mechanical Engineering lcsh:Mechanical engineering and machinery Mechanics Bubbly flows Pseudo turbulence Second-order turbulence model K-epsilon model Condensed Matter Physics Nonlinear Sciences::Chaotic Dynamics Physics::Fluid Dynamics Mechanics of Materials Homogeneous Order (business) Turbulence closures Physics::Space Physics lcsh:TJ1-1570 |
| Zdroj: | Journal of Applied Fluid Mechanics, Vol 12, Iss 6, Pp 1813-1823 (2019) |
| ISSN: | 1735-3572 |
| Popis: | First and second turbulence models for turbulent bubbly flows are implemented in the CFD code. In the second order turbulence closure, the Reynolds stress tensor of the continuous phase is split into two parts: a turbulent part produced by the gradient of the mean velocity and a pseudo-turbulent part induced by the bubbles displacements; each part is predetermined by a transport equation. The turbulent viscosity issued from this modeling takes into account the excess of the agitation and the supplementary eddies stretching due to the bubbles displacements. First order turbulence closure based on this turbulent viscosity is deduced and a three-equation turbulence model (k, ks, epsilon) is developed. We present the most prominent steps of the modeling and of its implementation in the CFD code then we comment the application of the model in the two homogeneous turbulent flows (uniform and uniformly sheared bubbly flows). |
| Databáze: | OpenAIRE |
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