KARALIT CFD software

Usually, a body conforming grid is being used for computing the flow around an arbitrary body. This approach requires coordinate transformations and/or complex grid generation. Especially for moving bodies, in every time step a new mesh has to be generated, which requires a lot of computing time. In contrast, an immersed boundary method uses a non body conforming Cartesian grid. In general a body does not align with the grid, so some of the computational cells will be cut. The cut cells can be treated in several ways. These treatments can be globally categorized into a continuous forcing approach, a discrete forcing approach and cut-cell methods.

Since the original development of this method by Peskin, a variety of approaches have been developed to simulate flow over complicated immersed bodies on grids that do not conform to the surface of the body. These include methods such as the immersed interface method, the Cartesian grid method, the ghost cell method and the cut-cell method.


Baced on Ghost Cell Immersed Boundary method, KARALIT has pioneered a breakthrough called Direct CFD, where CAD models go directly to CFD without time-consuming meshing or tedious manual set-up. The simple process streamlines CAD-to-CFD for experts and non-specialists alike..


The KARALIT revolution is based on four innovations:

A unique, proprietary implementation of immersed boundary (IB) technology that enables geometry to be immersed into Cartesian grids, eliminating meshing, maintaining the integrity of cells, and speeding CAD-to-CFD iterations throughout the design cycle.

The use of pre-designed apps that automate, simplify and speed set-up for industry-specific simulations.

A flexible pricing structure that enables users to take full advantage of the latest hardware advances at no extra software cost.

A personal, one-to-one, responsive technical support, bringing the benefits and experience of complex engineering problem-solving across a broad range of industrial sectors - no call centers!

The KARALIT approach, called Direct CFD provides simple fill-in-the-blank Apps to streamline setup for specific industries:

  • External Flow App:
    KARALIT provides two Apps for aerospace external aerodynamic simulations: "External Flow" and "Wind Tunnel". Both customized Apps walk the user through the necessary inputs to set up boundary conditions, flow regime and other parameters. Within minutes, even CFD novices can begin running high-quality simulations.
  • Wind Tunnel App:
    KARALIT has developed a "Wind Tunnel" App, to help deisgners and CFD analysts during the aerodynamic study of the car. The App can be used for studies of factors such as airflow around car bodies, pressure distribution, turbulence and drag. Users simply enter the parameters for key factors and the app takes over, setting up the boundary conditions for a highly accurate simulation.
  • Building Flow App - Environmental Terrain Flow App:
    The "Building Flow" App can be used for build environment applications such as pedestrian comfort outside of buildings and on walkways, smoke dispersal and fire safety: it can also be used for energy efficiency inside building walls and antennas. Another app, named "Environmental Terrain Flow" App, has been designed to perform a wind site assessment study. As for all KARALIT Apps, setting up the simulation involves only a few minutes of user time to input parameters.
  • Internal Flow App:
    KARALIT's "Internal Flow" App drastically simplifies the setup of complex geometries from automotive, aerospace, Oil&Gas, medical and other sectors. Users work directly on their CAD geometry and, through the App, enter a few key inputs - such as the boundary conditions, fluid properties and flow regime, going from CAD to simulation in a few minutes.

For more information you can click www.karalit.com