Fluid Dynamics

The most important thing is to have a fundamental understanding of the flow physics when working with fluid dynamics.

The team working with fluid dynamics at Creo consists of a number of people who are deeply engaged in the world of fluids. We take pride in working an hour or two later in the evening to find that last point of drag reduction or lift increase.

Sometimes, a problem is efficiently solved through engineering judgment or methods by hand. Most of our work is however done through CFD simulations, where our team is highly proficient in many of the commonly used commercial softwares such as Fluent, CFX, Star-CCM+EdgeICEM, ANSA and HyperMesh.

Our preferred CFD software is the open-source platform OpenFOAM. The fact that its source code is completely open makes it highly customizable. This suits us perfectly since we then can program the CFD solvers to completely fit our needs. Examples include designing our own adaptive boundary conditions to simulate active flow control systems, or to simulate an active buffeting cancellation system in a passenger car with an open window.








Applications

The coworkers in the fluid dynamics team have extensive experience in working with a wide variety of projects and branches. Some examples are given here.

CFD methodology

  • We develop and deliver simulation tools and procedures tailored towards specific needs and applications always with a conscious balance between turn-around time and accuracy.
  • Development of computational methods to improve efficiency and fidelity of the aerodynamic design process in the ultra-competitive F1 industry.
  • Wind tunnel and CFD correlation, including analysis and design of adaptive walls and boundary layer suction systems.  
  • Modification of the source code of OpenFOAM to implement own solvers, boundary conditions and feedback/feedforward algorithms (C++).

Vehicle aerodynamics & thermal management

  • CFD-simulations of the aerodynamics of passenger cars and truck-trailer configurations, including optimization of vehicle design for reduced drag (RANS,U-RANS & DES).
  • Design of Formula 1 cars for optimized aerodynamic performance and efficiency.
  • Engine, exhaust and brake cooling management of high performance cars.
  • Dimensioning of the cooling package for passenger cars, including development of an "active front grille" system.

Aerospace aerodynamics

  • Simulation and analysis of aerodynamic forces on aircraft, both in the subsonic and supersonic range.
  • Conceptual study of novel methods for maneouvering aircraft using active flow control.

Active Flow Control

  • Simulations of AFC in passenger cars and trucks, including development of boundary conditions, optimization of parameters and analysis of flow field effects (U-RANS & LES).
  • Detailed actuator simulations: constant blowing, constant suction and zero-net-mass-flux actuators.

Aeroacoustics

  • Simulations (LES) of the automotive buffeting phenomenon occuring in cars travelling at highway speeds with a window open - with focus on the Helmholtz-Rossiter feeding mechanism and passive and active countermeasures.
  • LES of aeroacoustics around side-mirror in passenger cars.

Combustion

  • Combustion simulations for power generation systems. Including thermal management to avoid excessive loads on turbine blades.

Building aerodynamics

  • Evaluation of critical areas around proposed building for different wind directions.
  • Forces and shedding frequency of flow around protruding features of a building facade (LES).

Multi-phase flows

  • Fuel tank simulations, including fuel slosh behavior and refueling process with a target to avoid trapping air bubbles. 
  • Fuel pump modelling and simulation.