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Radiation in participating media using the Discrete ordinates method defines a large number of dependent variables (up to 168 for a single wavelength), which are placed in segregated groups. The number of dependent variables per segregated group and the nonlinear method settings depend on the Performance index parameter available in the heat transfer interface settings in the Participating Media Settings section. When multiple wavelength are considered, the variables relative to distinct wavelengths are not mixed together in the segregated groups.
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The Thermal Damage subfeature (added under Biological Tissue feature) defines an additional variable alpha that is placed in a dedicated segregated group.
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The Damping factor is set to 0.7.
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The Jacobian update is set to On first iteration for Time-Dependent studies, and to On every iteration for Stationary studies or when the liquid concentration on surfaces, cl_evap, is solved.
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The Maximum number of iterations is set to 5 for Time-Dependent studies, and to 50 for Stationary studies.
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The Damping factor is set to 0.7.
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The Jacobian update is set to On first iteration for Time-Dependent studies, and to On every iteration for Stationary studies or when the liquid concentration on surfaces, cl_evap, is solved.
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The Damping factor is set to 1.
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The Maximum number of iterations is set to 5 for Time-Dependent studies, and to 50 for Stationary studies.
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Using the Automatic highly nonlinear (Newton) option forces to start the computation with a very low damping factor and increases it carefully. Alternatively a low constant damping factor can be used. The damping factor ranges between 0 and 1. A constant damping factor equal to 0.1 is a very low value and should be robust but slow to converge. For low values of the damping factor, it is thus usually needed to increase the number of nonlinear iterations. If the nonlinear solver is unstable with such a damping factor then the automatic option should be used because it makes it possible to start with a lower damping factor and gradually increases it.
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