Transport Solver
Under the Transport Solver tab, several options regarding the solver for the transport of the concentration field are available. The solution algorithm for concentration field transport is integrated into the LIR solver only.
Stopping Criterion
Two different stopping criteria are available for the LIR transport solver:
- Error Bound: This stopping criterion stops the solver if the relative difference to a predicted diffusivity within the last iterations is smaller than the threshold set by the user. This stopping criterion predicts a correct solution based on previous iterations. Then the the relative error to the correct solution is approximated. This stopping criterion detects oscillatory behavior.
- Tolerance: This stopping criterion stops the solver if the relative change of diffusivity within the last iterations is smaller than the given threshold.
Additionally, it is possible to choose if the stopping criterion should consider the diffusivity only in normal direction (Flow diffusivity) or in both normal and tangential directions (Flow & tangential diffusivity).
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Parallelization
Transport Concentration Field calculations can be parallelized if the user’s license and hardware allow it.
The Parallelization Options dialog opens when clicking the Edit button, to choose between Sequential, Parallel, or Automatic Number of Threads. 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.
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Advanced Options
Unfold Advanced Options to gain access to several advanced solver options. Find a detailed description of these option in the respective chapter in the FlowDict user guide.
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