Multiphase modeling is coming of age in 2015 in STAR-CCM+ with the addition of a number of smart hybrid multiphase models that open up a range of new and exciting applications.
STAR-CCM+ now has no fewer than six multiphase models, each best suited for a particular range of applications and computational budgets, namely Eulerian Multiphase (EMP), Volume Of Fluid (VOF), Mixture Multiphase (MMP), Dispersed Multiphase (DMP), Lagrangian Multiphase (LMP), the Discrete Element Method (DEM), and the Fluid Film model.

In many applications, however, no one model is suitable for all the flow regimes that occur simultaneously at different points in the computational domain, and ideally we would like to combine the benefits of multiple models in a single simulation. Now with models such as the VOF-Fluid Film multiphase interaction model, this is possible.

STAR-CCM+ Part Coating Simulation

Rarely in life do we get the chance to get more for less, and the world of simulation is no different, or at least not until now.

Typically in our simulations we have to make compromises, and in choosing those compromises we need to know which models will give us the best information at the minimum cost. We must also understand the assumptions our choices carry and how these might influence the decisions we make. This after all is the art of being a good Simulation Engineer.

Before we begin and lose ourselves in the wonders of multiphase, imagine if you will a beach, the sun is beating down, the wind is blowing and the surf is up. The sea looks a little rough, but being a good Simulation Engineer the foamy seas pose no worries to you and your recent lunch…..

Island Eisberge am Schwarzen Strand 19

Overset Mesh is one of the coolest technologies in STAR-CCM+ as it allows objects to move around your computational domain freely without tying your mesh in knots, be that an overtaking car, an excavator arm, or the complex multiple motions involved in a production line. The motion does not even have to be prescribed, the Dynamic Fluid Body Interaction (DFBI) model allows you to solve for motion, in six degrees of freedom or less, based on the forces and moments acting on a body, such as a boat on a free surface, or a ball in a ball valve. To date, however, there has been one major constraint when using Overset Mesh, namely that all gaps had to be resolved with at least 2-4 cells, however small the gap, for Overset Mesh to work correctly. This limitation meant that for some cases with very small gaps, users had to choose between excessive cell counts or increasing the gap size in an unphysical manner.

No Need to Mind the Gap

The upcoming release of STAR-CCM+ v9.06 removes that constraint with the introduction of gap handling for Overset Mesh via the new “Zero Gap” Interface type.

One of the great things about working for CD-adapco is that I get to see a lot of cool animations that illustrate the exciting capabilities that are coming soon in STAR-CCM+. The frustrating part is that usually I can’t share these with you until just before the new feature is released. Which is why today I’m excited to show you two of my favorites, which I find myself watching over and over again. Both videos illustrate the new contact model for the DFBI (Dynamic Fluid Body Interaction) solver in STAR-CCM+ v9.04, which allows you to directly model contact and collisions between moving bodies and boundaries.

This February we announce the release of STAR-CCM+ v9.02 and one of the most exiting features to join the wealth of multiphase capabilities in this release is the Dispersed Multiphase (DMP) model.

The simulation of applications such as aircraft deicing/anti-icing, and vehicle soiling and water management will now take a fraction of the time with the new Dispersed Multiphase (DMP) model in STAR-CCM+ v9.02.

CD-adapco is committed to the philosophy of “simulating systems”. This gives our users the opportunity to take into account all the factors likely to influence the performance of their product in its operational life when building a simulation. As part of that commitment, one of our ongoing development themes in STAR-CCM+ involves making multiphase flows more accessible to all of our users. For this, we introduce a feature that allows you to tackle a wider range of industrial applications (bridging the “gaps” described above) by further improving solver performance.

RSM turbulence is useful for swirling flows

Let's explore some of the great new multiphase flow features that you'll be able to enjoy in STAR-CCM+ v8.06...

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Brigid Blaschak
Communications Specialist
Dr Mesh
Meshing Guru
Stephen Ferguson
Communications Manager
Matthew Godo
STAR-CCM+ Product Manager
Joel Davison
Product Manager, STAR-CCM+
Tammy de Boer
Global Academic Program Manager
Sabine Goodwin
Senior Engineer, Technical Marketing
James Clement
STAR-CCM+ Product Manager