## 8.7. Subdomains

For simulations with particle tracking, a subdomain has a Fluids tab that enables the subdomain to act as a porous medium that can absorb particles. The Absorption Diameter setting specifies the minimum size of particles that are absorbed (removed from the calculation) upon entering the porous region (that is, the subdomain).

Wherever multiple subdomains occupy the same volume, the smallest specified Absorption Diameter value is used.

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