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Fluid Mechanics (CFD)
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Droplet Breakup in a T-junction
Emulsions consist of small liquid droplets immersed in an immiscible liquid and widely occur in the production of food, cosmetics, fine chemicals, and pharmaceutical products. The quality of the product is typically dependent on the size of the droplets. Simulating these processes can help in optimi...
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Rising Bubble
The level set method is well suited for problems with moving boundaries in which the geometry’s topology changes with time. A bubble of oil that travels up through water and finally merges with oil at the top causes this kind of topology change. For problems where the topology is unchanged as a fu...
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Boiling Flow
When modeling boiling flows, the mass transfer across the phase boundary, as well as the absorption of latent heat as the liquid evaporates, needs to be accounted for.
Here, a liquid is initially at rest above a thin layer of vapor, where the temperature in both phases is that of the saturation t...
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Free Convection in a Water Glass
This model treats the free convection and heat transfer of a glass of cold water heated to room temperature. Initially, the glass and the water are at 5 °C and are then put on a table in a room at 25 °C.
The nonisothermal flow is coupled to heat transfer using the Heat Transfer module.
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Fluid-Structure Interaction with Two Fluid Phases
The following example demonstrates techniques for modeling a fluid-structure interaction containing two fluid phases in COMSOL Multiphysics. It illustrates how a heavier fluid can induce movement in an obstacle using the arbitrary Lagrangian-Eulerian (ALE) technique along with the Two-Phase Flow, Ph...
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Two-Phase Flow Modeling of a Dense Suspension
Liquid-solid mixtures (suspensions) are important in a variety of industrial fields, such as oil and gas refinement, paper manufacturing, food processing, slurry transport, and wastewater treatment. Several different modeling approaches have been developed by the CFD community, ranging from discrete...
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Forced Convection Cooling of Horizontal Circuit Board
In this suite of models, temperature distribution and fluid flow field is modeled with the General Heat Transfer and the Non-Isothermal Flow application modes. By modeling the fluid flow and heat transfer simultaneously the convective transfer is described very accurately. The results are analysed a...
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Thermal Decomposition of a Chemical through a Parallel Plate Reactor
This model investigates the unimolecular decomposition of a chemical passing through a parallel plate reactor. The heat sensitive compound is present in a water solution.
After entering the reactor, the liquid first experiences expansion, due to a step-change in geometry at the bottom plate. Befo...
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Convection Cooling of Memory Array Modules
In this example, we show the effects of poor design in an array of four memory chips cooled by a perpendicular cooling stream. Fluid flow is coupled to heat transfer in model. In this case, each memory module (or chip) forms an obstacle for the cooling of the ones positioned downstream in the flow.
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Bending Pipe
This model studies the fluid flow through a bending pipe in 3D for the Reynolds number 300 000.
Because of the high Reynolds number, the k-epsilon turbulence model is used. Calculations with and without corner smoothing are performed.
The results are compared with experimental data.
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