Velocity decomposition approach for steady incompressible flow around bluff bodies using a transpiration auxiliary surface
| Autor: | Nelson Manzanares-Filho, Lucas Lincoln Fonseca Soares, Ramiro Gustavo Ramirez Camacho |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Drag coefficient General Physics and Astronomy Laminar flow 02 engineering and technology Mechanics Wake Vorticity 01 natural sciences 010305 fluids & plasmas External flow Physics::Fluid Dynamics 020303 mechanical engineering & transports 0203 mechanical engineering Inviscid flow Incompressible flow 0103 physical sciences Cylinder Mathematical Physics |
| Zdroj: | European Journal of Mechanics - B/Fluids. 85:134-148 |
| ISSN: | 0997-7546 |
| Popis: | Viscous/inviscid interaction methods employing velocity decomposition have been explored for reducing computational costs in external flow problems. For this, viscous simulations are made in reduced computational domains encompassing the rotational flow region. The coupling of potential and viscous solutions is made on a boundary of negligible vorticity, assessed by means of sampling lines normal to the body wall and the wake. For bluff bodies, sampling lines at the rear tend to be submerged in rotational regions, making it difficult to build the coupling boundary. For overcoming this difficulty, it is proposed in this work to use a transpiration auxiliary surface to represent the influence of the body and the wake. The null vorticity criterion for finding the coupling boundary is also proposed. The proposals are tested for laminar flows around a square, a circular cylinder and a semi-ellipse. The obtained results are compared with those for extended domains. The velocity decomposition with an auxiliary surface is able to reproduce with satisfactory accuracy the flow fields in the reduced domain as well as the drag coefficient on the bodies. |
| Databáze: | OpenAIRE |
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