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Technical Briefs

# Calibrated Coarse Grid-Finite Volume Method for the Fast Calculation of the Underhood Flow of a Vehicle

[+] Author and Article Information
D. Langmayr

Kompetenzzentrum,
Das virtuelle Fahrzeug,
Forschungsgesellschaft mbH,
Inffeldgasse 21a, A–8010 Graz, Austria
e-mail: daniel.langmayr@v2c2.at

R. A. Almbauer

Graz University of Technology,
Inffeldgasse 25/B, A–8010 Graz, Austria
e-mail: raimund.almbauer@TUGraz.at

W. Puntigam

Audi AG,

A. Lichtenberger

Magna Powertrain Engineering Center Steyr GmbH & CoKG,
Steyrer Strasse 32,
A-4300 Sankt Valentin, Austria

1Corresponding author.

Present address: Presently at ANSYS Germany GmbH.

Contributed by the Fluids Engineering Division of ASME for publication in the Journal of Fluids Engineering. Manuscript received February 9, 2012; final manuscript received February 13, 2013; published online August 6, 2013. Assoc. Editor: Zhongquan Charlie Zheng.

J. Fluids Eng 135(10), 104502 (Aug 06, 2013) (5 pages) Paper No: FE-12-1065; doi: 10.1115/1.4024749 History: Received February 09, 2012; Revised February 13, 2013

## Abstract

In this paper we introduce a novel method for calculating 3D flow through the underhood compartement of a vehicle. The method is based on the system of Euler equations, which are numerically solved by a finite volume approach. The total number of finite volumes is very low ($<$1000 cells). The applied numerics are calibrated to recapture a preceding detailed computational fluid dynamics {CFD) simulation. This calibration is established by two sets of factors. The main advantage of the present approach is that the calibration factors can be inter- and extrapolated between different CFD simulations.

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## Figures

Fig. 1

Schematic illustration of the geometry and the flow field (top) of example 1 and its representation in the coarse grid (bottom)

Fig. 2

Schematic illustration of two control volumes (example 2)

Fig. 3

Geometry and flow field for the test case

Fig. 4

Velocity field for the case u12 = 3 m/s

Fig. 5

Mass flow rate through the porosity (top) and the difference between the simulation and CFD results (bottom)

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