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Simulation controls
The underrelaxation factors and (in advanced mode) the number of nonorthogonal correctors can be changed in this section, see figure . Depending on the selection of incompressible or compressible calculation, the section offers modification of some or all of the following factors: pressure, velocity, density, temperature and turbulence. If available, the temperature and turbulence relaxation factors are always considered equal. The defaults are concisely summarized in the table .
 The entry “Nonortho correctors” sets the number of nonorthogonal correctors. Should be increased up to if simulation shows large time step continuity error.
 The entry “Minimal pressure” sets the lower bound for the pressure. If there is a cell with a lower pressure after a solver iteration it will be adjusted to this value. This bounding can help in the beginning of the solution process, when the fields wildly oscillate iterationtoiteration before stabilization. The minimal and maximal pressure bounds are given in numerical units, which is Pa in compressible calculation and in incompressible calculation, and in both cases without contribution of the reference pressure.
 The entry “Maximal pressure” sets the upper bound for the pressure.
 The entry “Maximal velocity” sets the upper bound for the magnitude of the velocity. Larger vectors are scaled to this magnitude.
 The entry “Minimal temperature” sets the lower bound for the temperature. This is only available for the compressible setup.
 The entry “Maximal temperature” sets the upper bound for the temperature. This is only available for the compressible setup.
 The entry “Minimal density” sets the lower bound for the density. This is only available for the compressible setup.
 The entry “Maximal density” sets the upper bound for the density. This is only available for the compressible setup.

Figure: Plugin TCFDSource – simulation controls: relaxation factors and bounding limits.
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