How to select a solver

In addition to the processor selection (CPU or GPU), you can also select which solver scheme to utilise. TVD is the only solver scheme available on the GPU.

Solver schemes are selected per 2D domain and your model may have multiple domains, thus requiring multiple selections. The solver scheme selection is made on the Options sub-tab of the Domains tab. First select the Domains tab at the top of the window, then select a domain (i.e. highlight a row in the domains table) and then click the Options sub-tab.

Note: In addition to the solver selection you can also choose whether to work in single or double precision. The former may deliver faster run-times but the latter may be required to deliver required accuracy and model stability.

Please note:

• The solver scheme will automatically adjust to TVD when you select the GPU solver. This is the only solver scheme available.
• The TVD solver requires smaller timesteps than the ADI solver. To ensure that the simulation’s maximum Courant number runs around 1, the ratio of simulation time step to the domain resolution needs to be relatively small (~1/10).
• If you adjust from the GPU solver back to the CPU solver, the TVD solver scheme will remain selected.
• If you are using multiple domains, selecting the GPU solver will apply the GPU solver (and TVD solver scheme) to all of your domains. You cannot 'mix and match'.