# 2.12. Version 5.8 (2022/07/11)

New Features

  - Assemblies are now supported in Aria

  - Using the previous guess during radiosity solves should result in improved performance; see the user manual for more details

  - Added thermal expansion term in Coussy porosity model

  - Added ability to use postprocessed fields in boundary conditions across equation systems

Bug Fixes

  - Fix bug in line search that ignored other nonlinear acceptance criteria

  - Bug fix for NAN in Bingham WLF viscosity model

Upcoming Deprecations (will warn in 5.8)

  - The use of `postprocess FLUX_TYPE for EQ` is no longer supported, use `postprocess FLUX_TYPE of equation EQ` instead to better distinguish between postprocessors that operate on equations vs expressions.

  - Several unused ChemEq solver parameters have been deprecated. These commands have been unused and ignored for several releases.

  - The EXP_DECAY density model has been deprecated. Use a scalar string function as a replacement.

  - The output from the `Time Derivative = Calculated` expression has been changed from `ddt_something` to `dt_something`. Both outputs will be produced in 5.8 but in 5.10 only the `dt_` output will be present.