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


Large Eddy Simulation

Wind Tunnel.

Bluff Body Flow

Modal Decomposition


Vehicle Aerodynamic


Active Flow Control


Partially Averaged Navier Stokes


Opponent: Jacques Borée


Guglielmo Minelli

Chalmers, Applied Mechanics, Fluid Dynamics

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

Applied Mathematics and Computation,; Vol. 272(2016)p. 692-706

Journal article

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 in proceeding

Areas of Advance



Subject Categories

Vehicle Engineering

Fluid Mechanics and Acoustics


Opponent: Jacques Borée

More information