Select a Flow Model
In the FlowDict section, the available flow models are listed in the pull-down menu. After choosing the appropriate approach for the material structure, the options for the selected flow model need to be entered. For the selection between the flow models to be solved, the conditions of the flow, the properties of the fluid, and the components of the structure must be taken into account. Find detailed information on PDEs and how to select the right flow model for your current experiment in the PDE section.
Stokes(-Brinkman)
The Stokes(-Brinkman) equation provides good results for fluids with high viscosity, such as oil, with slow, laminar flows defined by small Reynolds numbers but can lead to non-physical effects.
Find details on the settings for the flow model here.
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Navier-Stokes(-Brinkman)
The Navier-Stokes(-Brinkman) equation is preferable for gas filtration processes (e.g., of air), because it allows for non-linear effects. The equation entails being solved with the SimpleFFT and LIR solver and, implicitly, slightly longer run times and higher memory requirements.
Find details on the settings for the flow model here.
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Forchheimer Approximation
The Forchheimer Approximation has been introduced in FlowDict to approximate pressure drop or mean velocity for very high Reynolds number that cannot be computed by solving the Navier-Stokes(-Brinkman) equation with the available solvers. With at least two mean velocity / pressure drop pairs, it is possible to approximate other pairs with quadratic regression by least squares analysis.
Find details on the settings for the flow model here.
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Simulate Flow Experiment
Use Simulate Flow Experiment if the inlet and outlet are not axis-aligned in the same flow direction, for example if the flow entries and leaves a component through tubes.
Find details on the settings for the flow model here.
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Darcy Flow
Use Darcy Flow, if the structure has a large voxel length, no resolved through-path but instead porous materials with small permeabilities where the viscous term can be neglected, e.g., rocks on the macroscale. The structure in this example has a voxel length of 400 µm and permeabilities of 10‑12 m2 and smaller.
Find details on the settings for the flow model here.
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Single-Phase Flow GeoApps
Select Single-Phase Flow GeoApps for representative flow simulation examples. Currently, two GeoApps regarding Air Permeability Tests are available.
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