Selecting the Adiabatic PCFM

To solve combustion problems using an adiabatic PPDF model, follow the steps below. Some of the selections will be made automatically if the Auto-select recommended physics models checkbox is ticked.

In the Physics Model Selection dialog, select a material model from the Material group. Typically, this will be Multi-Component Gas.

Specify that your problem involves simulation of chemical reactions by selecting Reacting in the Reaction Regime group.

Select Partially-Premixed Combustion from the Combustion group.

Select Adiabatic Partially-Premixed CFM from the Partially-Premixed Combustion group.

Select Coherent Flame Model from the Premixed Models for PCFM group.

Select Adiabatic PPDF from the Non-Premixed Adiabatic Models for PCFM group.

Select the desired adiabatic model type, PPDF Equilibrium or PPDF Flamelet, from the Partially-Premixed Ppdf Reaction group.

Select PCFM Ideal Gas from the PCFM Equation of State group.

Select the desired solver type, Coupled Flow or Segregated Flow, from the Flow group.

The Physics Model Selection dialog will contain your selections similar to the example shown below. In this example the options PPDF Equilibrium and Coupled Flow were selected.

The remaining selections in this dialog depend on problem characteristics that are not specifically related to simulating combustion:

Select the Implicit Unsteady or Steady option from the Time group, depending on the nature of your simulation.

Select Turbulent from the Viscous Regime group as this type of combustion model is only valid for turbulent flows.

Select Gravity from the Optional Physics models group if gravity forces significantly influence the solution, e.g. in fire simulations.