2014
SESDE 2014 Proceeding
Automatic grid generation from a numerical picture for transient flow simulation over a car shape obstacle
Authors: Tonino Sophy, Julien Jouanguy, Luis Le Moyne
Abstract
Computer assists numerization of a domain, requires several engineers or scientists during considerable time. Thus, meshing automatization process has been developed using heavy devices like LASER metrology. It can sometimes be more convenient to use simple devices. Image processing field, reveals many works concerning object detection. Applications concern medical field, automotive, face detection or national defense. This paper aims proposing a simple, but accurate enough, tool to generate 2D domain meshing from a numerical picture that can be used with a transient Finite-Volume CFD code. A car shape object is chosen. From the original picture, edge detection and threshold techniques are applied and then, the object contour points? gird is provided. Another process is applied to generate a refined Finite- Volume mesh compatible with Gerris Flow solver. Transient simulations are conducted at different Reynolds numbers. Results, in terms of pressure fields or velocity evolutions, are shown. Von-Karman alley flow is detected.
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