Drag Reduction by means of Active Flow Control Applied on a Generic Truck A-pillar: a Numerical and Experimental Study
Licentiatavhandling, 2016

The overall goal of this thesis is to isolate and control the flow mechanism characterizing the flow separation occurring at the A-pillar of a truck. The study aims to gain knowledge of the flow physics of the separation mechanism, and to eventually suppress the afore mentioned separation by means of an Active Flow Control. State of the art unsteady numerical simulations and experiments are both employed to carry out this work. LES are performed at Re = 1 × 10 5 and post processed (by means of POD and FFT), to study the physics of the flow structures. Further, the hybrid PANS method is tested on several bluff body flows evaluating limits and qualities. The use of a hybrid technique as such is necessary to minimize the computer resources, while still being able to simulate a ”close to reality” Re. In the last part of the work, PANS are validated against wind tunnel experiments on a 3-D generic truck cabin. In the latter part PANS simulations are also employed to conduct an optimization study of the actuation frequency.

PANS

Large Eddy Simulation

Wind Tunnel.

Bluff Body Flow

Modal Decomposition

Experiments

Vehicle Aerodynamic

POD

Active Flow Control

LES

Partially Averaged Navier Stokes

AFC

Delta/Gamma
Opponent: Jacques Borée

Författare

Guglielmo Minelli

Chalmers, Tillämpad mekanik, Strömningslära

Partially-averaged Navier–Stokes simulations of two bluff body flows

Applied Mathematics and Computation,; Vol. 272(2015)p. 692-706

Artikel i vetenskaplig tidskrift

Actuation of the flow field around a frontstep with a rounded leading edge

8th international symposium on Turbulence, Heat and Mass Transfer, September 15-18, 2015, Sarajevo, Bosnia and Herzegovina,; (2015)

Paper i proceeding

Styrkeområden

Transport

Energi

Ämneskategorier

Farkostteknik

Strömningsmekanik och akustik

Delta/Gamma

Opponent: Jacques Borée

Mer information

Skapat

2017-10-08