The talk will present current research in in numerical simulation of turbulent flows of bluff bodies such as vehicles performed within Vehicle Aerodynamic Laboratory (VAL) at Chalmers University of Technology (http://www.tfd.chalmers.se/~sinisa/). The research of VAL consists of exploration of flow physics around bluff bodies, improvement of aerodynamic performance of vehicles and development of numerical methods for predictions of turbulent flows of engineering relevance. Our exploration of flows around bluff bodies is performed using so called scale-resolving numerical simulations of turbulent flows. There are several different approaches for prediction of turbulent flows and they range in complexity of how much of the turbulence is resolved or modeled. This talk will present an overview of different approaches. Most of our simulations are computer intensive and a typical simulation uses between 200 000 -400 000 CPUhours. We often concentrate on simplified vehicles or only parts of vehicles and use high fidelity numerical techniques as a "magnifying glass" that can show detailed flow structures and their interaction. This knowledge can later be used to explain the flow physics at real vehicles. The fundamental understanding of the flow physics around bluff bodies is crucial for the second track of our activity, namely, improvement of aerodynamic properties of vehicles. Several different techniques for aerodynamic shape optimization and flow control have been developed within VAL and some of them will be presented during the talk. Our research in numerical simulations of flow control for reduction of aerodynamic drag of vehicles will be presented.