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CFD Applications

Frustrum shaped mixing vessel

This example shows a frustrum shaped mixing vessel with a simple rotating blade. The

inlet and outlet are omitted. The challenge is the fast and exact computation of the

free surface. In particular the agitator blade can partly surface as it is close to the free

surface.

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CFD ApplicationsTwin-screw agitator in a double cylinder

Twin-screw agitators exhibit more complicated fluid mechanical phenomena than foundin single-screw agitators. Mesh based simulation methods usually fail to efficiently deal

with the overlapping operation ranges of the rotating blades. In NOGRID software there

is no difference in modelling and computation efficiency compared to a single-screw

agitators.

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CFD Applications

Foaming Polyurethane

Polyurethanes are synthetic materials or resins covering a wide range of stiffness,hardness and densities. They are used as low density foam e.g. in upholstery fabrics and

refrigerator insulation and as soft or hard plastic parts ranging from shoes to skateboard

wheels to car dashboards to vibration and shock absorbers, to name just a few examples.

In most industrial production processes liquid polyurethane is injected into a closed mold

where it reacts and expands to finally fill out the mold. In this process air bubbles mightbe entrapped, or a structural failure of the hardened but still expanding plastic might

occur, resulting in defects, instabilities or unattractive surfaces.

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CFD Applications

Water Wave coming on Lighthouse

This example shows the possibilities of modelling water waves. You can also evaluate the

stability of the building depending on the strength of the wave.

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CFD Applications

Accelerated Boat

Free surfaces in fluid mechanical systems are a great challenge for numerical simulationmethods in themselves. However, many applications additionally exhibit moving structures

interacting with the fluid. In most cases a realistic modelling with todays standard software

is simply not feasible or would at least require a non economical amount of time and

computational power to solve everyday simulation problems. One such example is the

simulation of a boat being accelerated until it reaches its final inclination determined by its

hull shape and its speed.