Extendsive Inc.: Authorized Distributor of XFlow CFD in North America
Extendsive Inc.:  Authorized Distributor of XFlow CFD in North America


XFlow CFD is ideal for flow modeling for automobile, truck, and heavy equipment design and can be used for a variety of different modeling purposes.


Application Areas Include:

  • External Vehicle Aerodynamics
  • Aeroacoustics
  • Water & Soil Management
  • Discrete Phase Model
  • Cabin Comfort
  • Thermal/Cooling
XFlow CFD simulation of airflow around a moving vehicle with spinning wheels.

External Vehicle Aerodynamics:  The virtual wind tunnel module in XFlow makes it possible to run full-scale external aerodynamics simulations that can be set up in minutes. The solver is able to compute aerodynamic loads over complex geometry, including the effect of rotating wheels and moving parts. It is possible to analyze overtaking or dynamic systems such as the vehicle suspension.

XFlow CFD simulation of a car passing a moving truck.

Aeroacoustics:  The XFlow solver operates at acoustic time scale solving simultaneously the aerodynamics and the acoustic pressure wave propogation.  Simulations from internal noise sources, such as radiator fans, and external sources, such as buffeting from mirrors or open sunroof, can all be modeled.  Shown below is an aeroacoutsic analysis of the impact of a side mirror.

XFlow CFD aeroacoustic analsysi of an automobile side mirror.

Water and Soil Management:  XFlow is able to simulate free surface problems such as the refueling process, sloshing in the fuel tank, splashing of the wheels on a wet road or driving through water.  A multiphase problem involving two vehicles passing on a wet road, with wind impact and splashing, can be set up almost as easily as a simple wind tunnel simulation.

Shown is a video of an XFlow CFD simulation for modeling the performance of windshield wipers being tested in a manufacturer's test facility.

Discrete Phase Model:  In addition to solving the transport equations for the continuous phase, XFlow allows the user to simulate a discrete phase in a Lagrangian frame of reference. This discrete phase can represent droplets, hail, dust, bubbles, etc. dispersed in the continuous phase.  This capability is perfectly suited for colloidal flows or soiling applications.  Shown is a model for the performance of a wiper system being tested in a manfacturer's test facility.


Cabin Comfort:  XFlow can simulate the heating, ventilation, and air conditioning system in a vehicle cabin. Fans can be modeled either as rotating parts or using surface boundary conditions. It is possible to analyze the interior airflow, measure temperature at different locations, and even calculate the passive scalar transport of substances, such as dust.

Shown is a video of an XFlow CFD simulation of the distribution of cabin air coming from the main ventilation port and distributing throughout the cabin.
Thermal/Cooling: The thermal solver together with the radiation model allows the user to compute the heat flux and temperature in the underhood and underbody regions coupled to the aerodynamics of the vehicle.


For more information, or for questions about a specific application, contact us here.

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