In the Flow Calculation panel on the top left, select the Flow Solver Type to be used for solving the chosen partial differential equations from the pull-down menu (EJ, SimpleFFT, or LIR). EJ cannot be selected for solving Brinkman equations.

It is also possible to choose Load from file to import the result file (*.gdr) of a fluid flow simulation previously executed with FlowDict or AddiDict. In this case, computational time is saved by re-using this result, and no additional flow simulation must be executed.

Check the Analyze Geometry button to check whether a through path for the flow through the structure exists. For very large structures, this can take some time, thus it can be turned off in this case. This option is not available for the Transport Concentration Field command.

In the lower left panel, calculations can be parallelized if the user’s license and hardware allow it. For the Transport Concentration Field command, this option is available in the Solver Settings subtab.

The Parallelization Options dialog opens when clicking the Edit button, to choose between Sequential, Parallel, Automatic Number of Threads or Cluster. When Sequential is selected, no parallelization is applied. When Parallel is selected, the Number of Threads can be entered.

If Automatic Number of Threads is selected, the number of parallel processes is automatically selected for optimal speed, based on the CPU cores and licensed parallel processes.

For up to eight Available Threads, all of them will be used. If more than eight threads are available, two cases might occur:

• The number of Available Threads is larger (or equal) than the Number of CPU Cores:
  • Then the maximum of eight and Number of CPU Cores divided by 2 is used.

• The number of Available Threads is smaller than the Number of CPU Cores:
  • Then the maximum of eight and number of Available Threads divided by 2 is used.

The choice of Cluster is for computations on Linux clusters, but it is not available for the LIR solver. See the High Performance Computing handbook for information on how to license GeoDict for these options and how to perform GeoDict computations on a cluster.

In the right panel of the Solver tab, the subtab of the solver chosen to solve the equations governing the fluid flow is selectable after choosing a solver type (Load from File, EJ, SimpleFFT, or LIR solver) in the Flow Calculation panel on the left. The options for the selected solver are set in this subtab, shown here for the LIR solver. View also the Advanced Options by a left mouse click on the small black triangle.

If Load from File has been selected from the Flow Solver Type menu in the Flow Calculation panel above, choose a GeoDict result file of a previously run computation. Some information about the computation is shown. The mean velocity of the computation can be rescaled to another one by checking Rescale and editing the mean velocity.

The EStatic subtab is only active when Include Electrostatic Effects has been checked previously under the Electrostatic Effects subtab. This option is not available for the Transport Concentration Field command. The Dirichlet Boundary Offset has to be specified under the EStatic subtab if electrostatic effects are considered in the simulation. This value defines the distance to the computational domain, at which the Dirichlet boundaries for the electric field are installed in the flow direction of the fluid. Essentially, this value should be infinite, but a practical value must be given to run the calculations, see the corresponding equation for more details.

For more details on the flow solvers and their respective settings please refer to the FlowDict user guide.