Use Simulate Flow Experiment if the inlet and outlet are not axis-aligned in the same flow direction, for example if the flow enters and leaves a component through tubes. Define where the flow enters and leaves the structure by setting-up one inlet and one or more outlets. Usually, the complete structure is encased by solid voxels except for the inlet and outlet voxels. But is also possible to have half or quarter of the structure in memory and use symmetric boundary conditions instead. The inlet and outlet are defined by certain material IDs.

The inlet and outlet materials must be defined in the structure with certain conditions:

• While they must have different material IDs, inlet and outlet should have the same material (i.e., fluid) as the pore space inside the structure.
• While several IDs can be defined as outlet, only one ID can be set to inlet.
• There can be several inlet and outlet areas. They can even be located at different sides of the structure.
• Since GeoDict 2024 inlet and outlet can be thicker than 1 voxel and do not need to be axis-aligned anymore. Also, pore voxels at the boundary are allowed.
• Only one connected pore system is allowed.
  • It must contain all fluids and porous materials as well as inflow and outflow areas.
  • Inlet and outlet are not allowed to be connected via an outer fluid.

If the inlet or outlet are not set correctly, then an error message appears when running the simulation.

If the inlet/outlet material IDs additionally have the Information Inlet, Inflow, Outlet or Outflow, they will be automatically selected as inlet or outlet in the Flow Experiment tab.

The information can be set while editing the materials either in the Constituent Materials tab or in the Constituent Materials dialog available by selecting Settings → Select Constituent Materials from the menu bar in GeoDict. After clicking on the material ID to change in the Material Selector on the left information can be added.