# ASPECT Newsletter #83

**URL:** <https://community.geodynamics.org/t/aspect-newsletter-83/711>\
**Category:** ASPECT\
**Created:** [July 10, 2019, 7:00pm UTC](https://community.geodynamics.org/t/aspect-newsletter-83/711 "2019-07-10T19:00:21Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![rgassmoeller](https://yyz2.discourse-cdn.com/flex036/user_avatar/community.geodynamics.org/rgassmoeller/32/49_2.png) [@rgassmoeller](https://community.geodynamics.org/u/rgassmoeller)\
**Post date:** [July 10, 2019, 7:00pm UTC](https://community.geodynamics.org/t/aspect-newsletter-83/711/1 "2019-07-10T19:00:21Z")

</div>

Hello everyone!

```
       This is ASPECT newsletter #83.

```

It automatically reports recently merged features and discussions about the ASPECT mantle convection code.

Below you find a list of recently proposed or merged features:

[#3180](https://github.com/geodynamics/aspect/pull/3180): Fix Tosi Case 4 benchmark (proposed by [anne-glerum](https://github.com/anne-glerum))  
[#3179](https://github.com/geodynamics/aspect/pull/3179): Add new solver scheme: single advection, iterated Newton Stokes (proposed by [anne-glerum](https://github.com/anne-glerum))  
[#3178](https://github.com/geodynamics/aspect/pull/3178): Add composition density formulation (proposed by [gassmoeller](https://github.com/gassmoeller))  
[#3177](https://github.com/geodynamics/aspect/pull/3177): Fix spaces, reference and spelling (proposed by [anne-glerum](https://github.com/anne-glerum); merged)  
[#3176](https://github.com/geodynamics/aspect/pull/3176): Move assignment to old\_solution to the only place it is used (proposed by [gassmoeller](https://github.com/gassmoeller); merged)  
[#3175](https://github.com/geodynamics/aspect/pull/3175): Fix floating point exception caused by accessing timestep prematurely (proposed by [gassmoeller](https://github.com/gassmoeller))  
[#3174](https://github.com/geodynamics/aspect/pull/3174): Correct behavior of VoF interface refinement algorithm near MPI process boundaries (proposed by [class4kayaker](https://github.com/class4kayaker))  
[#3173](https://github.com/geodynamics/aspect/pull/3173): Replace dynamic cast in cookbooks and benchmarks (proposed by [gassmoeller](https://github.com/gassmoeller); merged)  
[#3172](https://github.com/geodynamics/aspect/pull/3172): Fix deprecation message with deal.II 9.1 (proposed by [gassmoeller](https://github.com/gassmoeller); merged)  
[#3171](https://github.com/geodynamics/aspect/pull/3171): add missing doxygen comment (proposed by [tjhei](https://github.com/tjhei); merged)  
[#3170](https://github.com/geodynamics/aspect/pull/3170): update parameters (proposed by [tjhei](https://github.com/tjhei); merged)  
[#3169](https://github.com/geodynamics/aspect/pull/3169): Better Compositing model and AdditionalOutputs (proposed by [tjhei](https://github.com/tjhei))  
[#3167](https://github.com/geodynamics/aspect/pull/3167): Use the same initialization for operator splitting as for normal time stepping (proposed by [gassmoeller](https://github.com/gassmoeller); merged)  
[#3159](https://github.com/geodynamics/aspect/pull/3159): Add pull request template (proposed by [gassmoeller](https://github.com/gassmoeller); merged)  
[#3157](https://github.com/geodynamics/aspect/pull/3157): Rename isothermal to isentropic compression (proposed by [gassmoeller](https://github.com/gassmoeller); merged)  
[#3137](https://github.com/geodynamics/aspect/pull/3137): Updated: Material model that sets a constant viscosity in the lithosphere (proposed by [SophieCoulson](https://github.com/SophieCoulson); merged)

A list of all major changes since the last release can be found at [this website](https://aspect.geodynamics.org/doc/doxygen/changes_current.html) .

Thanks for being part of the community!

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Let us know about questions, problems, bugs or just share your experience by visting our [forum](https://community.geodynamics.org/c/aspect), or by opening issues or pull requests on [Github](https://www.github.com/geodynamics/aspect).
Additional information can be found at our [official website](https://aspect.geodynamics.org/), and CIG's [ASPECT website](https://geodynamics.org/cig/software/aspect/).
```