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[FAQ]

These multipliers are introduced to model effects of species of filtering and augmentation. Species concentration at the recirculating boundary is multiplied by specified multiplier factors. If the multiplier is set to 1.0, no change in concentration occurs at the recirculating boundary. In other words, with multipliers set to 1.0, no species are added or removed at the recirculating boundary, and the overall volume integral of concentration is expected to be unchanged unless there is supply of species through another boundary. If the multiplier is less then 1.0, then this would correspond to filtering (removal of species form the loop). If the multiplier is greater that 1.0, then this would reproduce effect of augmentation (adding species to the loop). Note that recirculating boundaries is an unsupported hidden feature in Fluent. This is an Icepak boundary condition, and additional information can be found in Icepak Documentation sections on recirculating openings.