Volume 18, Issue 4
Vortical Flow Structure in the Wake of an Estate Car

Phillip Gwo-Yan Huang & Tony Wen-Hann Sheu

Commun. Comput. Phys., 18 (2015), pp. 881-900.

Published online: 2018-04

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  • Abstract

A finite volume simulation of unsteady vortical wake flow behind a squareback estate car is presented. The three-dimensional time-averaged incompressible Navier-Stokes equations are solved together with the Reynolds stress transport equations for turbulence. By virtue of the simulated surface streamlines, the physics of fluid can be extracted using the topological theory. In addition, the simulated topological singular points and lines of separation are plotted on the car surface. The vortical flow motions that developed behind the mirrors, wheels and car body are explored by means of the simulated time evolving vortex corelines. The formation and interaction of the vortex systems in the wake are examined by tracing the instantaneous streamlines in the vicinity of the simulated vortex corelines. The vortex street behind the estate car is also illustrated by the simulated streaklines. Finally the Hopf bifurcation phenomenon is revealed by the time-varying aerodynamic forces on the car.

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@Article{CiCP-18-881, author = {}, title = {Vortical Flow Structure in the Wake of an Estate Car}, journal = {Communications in Computational Physics}, year = {2018}, volume = {18}, number = {4}, pages = {881--900}, abstract = {

A finite volume simulation of unsteady vortical wake flow behind a squareback estate car is presented. The three-dimensional time-averaged incompressible Navier-Stokes equations are solved together with the Reynolds stress transport equations for turbulence. By virtue of the simulated surface streamlines, the physics of fluid can be extracted using the topological theory. In addition, the simulated topological singular points and lines of separation are plotted on the car surface. The vortical flow motions that developed behind the mirrors, wheels and car body are explored by means of the simulated time evolving vortex corelines. The formation and interaction of the vortex systems in the wake are examined by tracing the instantaneous streamlines in the vicinity of the simulated vortex corelines. The vortex street behind the estate car is also illustrated by the simulated streaklines. Finally the Hopf bifurcation phenomenon is revealed by the time-varying aerodynamic forces on the car.

}, issn = {1991-7120}, doi = {https://doi.org/10.4208/cicp.271114.250515s}, url = {http://global-sci.org/intro/article_detail/cicp/11054.html} }
TY - JOUR T1 - Vortical Flow Structure in the Wake of an Estate Car JO - Communications in Computational Physics VL - 4 SP - 881 EP - 900 PY - 2018 DA - 2018/04 SN - 18 DO - http://dor.org/10.4208/cicp.271114.250515s UR - https://global-sci.org/intro/article_detail/cicp/11054.html KW - AB -

A finite volume simulation of unsteady vortical wake flow behind a squareback estate car is presented. The three-dimensional time-averaged incompressible Navier-Stokes equations are solved together with the Reynolds stress transport equations for turbulence. By virtue of the simulated surface streamlines, the physics of fluid can be extracted using the topological theory. In addition, the simulated topological singular points and lines of separation are plotted on the car surface. The vortical flow motions that developed behind the mirrors, wheels and car body are explored by means of the simulated time evolving vortex corelines. The formation and interaction of the vortex systems in the wake are examined by tracing the instantaneous streamlines in the vicinity of the simulated vortex corelines. The vortex street behind the estate car is also illustrated by the simulated streaklines. Finally the Hopf bifurcation phenomenon is revealed by the time-varying aerodynamic forces on the car.

Phillip Gwo-Yan Huang & Tony Wen-Hann Sheu. (2020). Vortical Flow Structure in the Wake of an Estate Car. Communications in Computational Physics. 18 (4). 881-900. doi:10.4208/cicp.271114.250515s
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