# ASPECT Newsletter #169 **URL:** \ **Category:** ASPECT\ **Created:** [February 20, 2023, 5:00pm UTC](https://community.geodynamics.org/t/aspect-newsletter-169/2823 "2023-02-20T17:00:28Z")\ **Posts on this page:** 1\ **Page:** 1
**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:** [February 20, 2023, 5:00pm UTC](https://community.geodynamics.org/t/aspect-newsletter-169/2823/1 "2023-02-20T17:00:28Z")
Hello everyone! This is ASPECT newsletter #169. 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: [#5076](https://github.com/geodynamics/aspect/pull/5076): allow chunk and two merged chunks for spherical velocity statistics. (implemented by [MFraters](https://github.com/MFraters)) [#5075](https://github.com/geodynamics/aspect/pull/5075): Add use merged grid option (implemented by [MFraters](https://github.com/MFraters)) [#5074](https://github.com/geodynamics/aspect/pull/5074): free surface rebuild preconditioner (implemented by [tjhei](https://github.com/tjhei)) [#5073](https://github.com/geodynamics/aspect/pull/5073): tests: skip refinement in remove\_\* (implemented by [tjhei](https://github.com/tjhei)) [#5072](https://github.com/geodynamics/aspect/pull/5072): Fix deprication issue. (implemented by [MFraters](https://github.com/MFraters); reviewed by [tjhei](https://github.com/tjhei)) [#5070](https://github.com/geodynamics/aspect/pull/5070): skip refinement if mesh did not change (implemented by [tjhei](https://github.com/tjhei)) [#5069](https://github.com/geodynamics/aspect/pull/5069): fix solver comment (implemented by [tjhei](https://github.com/tjhei); reviewed by [MFraters](https://github.com/MFraters)) [#5068](https://github.com/geodynamics/aspect/pull/5068): GMG: code cleanup (implemented by [tjhei](https://github.com/tjhei); reviewed by [MFraters](https://github.com/MFraters)) [#5067](https://github.com/geodynamics/aspect/pull/5067): GMG: add assert (implemented by [tjhei](https://github.com/tjhei); reviewed by [MFraters](https://github.com/MFraters)) [#5066](https://github.com/geodynamics/aspect/pull/5066): GMG: shared MatrixFree objects (implemented by [tjhei](https://github.com/tjhei); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5065](https://github.com/geodynamics/aspect/pull/5065): add a new plugin for random initial temperature perturbations (implemented by [jdannberg](https://github.com/jdannberg)) [#5064](https://github.com/geodynamics/aspect/pull/5064): Remove unnecessary asserts in ellipsoidal chunk (implemented by [gassmoeller](https://github.com/gassmoeller); reviewed by [bangerth](https://github.com/bangerth)) [#5062](https://github.com/geodynamics/aspect/pull/5062): GMG: compute diagonal: cleanup (implemented by [tjhei](https://github.com/tjhei); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5061](https://github.com/geodynamics/aspect/pull/5061): GMG use compute diagonal part II (implemented by [tjhei](https://github.com/tjhei); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5060](https://github.com/geodynamics/aspect/pull/5060): GMG: use deal.II compute\_diagonal() part I (implemented by [tjhei](https://github.com/tjhei); reviewed by [tjhei](https://github.com/tjhei)) [#5059](https://github.com/geodynamics/aspect/pull/5059): Add option for time constant ascii data boundary (implemented by [gassmoeller](https://github.com/gassmoeller); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5058](https://github.com/geodynamics/aspect/pull/5058): doc: nonlinear solver improvements (implemented by [tjhei](https://github.com/tjhei); reviewed by [MFraters](https://github.com/MFraters)) [#5057](https://github.com/geodynamics/aspect/pull/5057): Update description ‘Allow fixed composition on outflow boundaries’ (implemented by [anne-glerum](https://github.com/anne-glerum); reviewed by [tjhei](https://github.com/tjhei)) [#5056](https://github.com/geodynamics/aspect/pull/5056): Refactor AsciiDataBoundary (implemented by [gassmoeller](https://github.com/gassmoeller); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5055](https://github.com/geodynamics/aspect/pull/5055): Refactor parse\_map\_to\_double\_array and add option to ignore keys (implemented by [gassmoeller](https://github.com/gassmoeller); reviewed by [bobmyhill](https://github.com/bobmyhill)) [#5054](https://github.com/geodynamics/aspect/pull/5054): doc: fix two-merged-chunks parameter description (implemented by [tjhei](https://github.com/tjhei); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5053](https://github.com/geodynamics/aspect/pull/5053): doc: fix broken prm includes (implemented by [tjhei](https://github.com/tjhei); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5052](https://github.com/geodynamics/aspect/pull/5052): Update installing-docker.md (implemented by [tjhei](https://github.com/tjhei); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5051](https://github.com/geodynamics/aspect/pull/5051): Standardize 2D-\>2d and 3D-\>3d in comments. (implemented by [bangerth](https://github.com/bangerth); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5050](https://github.com/geodynamics/aspect/pull/5050): Standardize 2D-\>2d and 3D-\>3d. (implemented by [bangerth](https://github.com/bangerth); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5049](https://github.com/geodynamics/aspect/pull/5049): improve bib file check (implemented by [tjhei](https://github.com/tjhei); reviewed by [tjhei](https://github.com/tjhei)) [#5047](https://github.com/geodynamics/aspect/pull/5047): Adds missed publications and new ones for January 2023 (implemented by [ljhwang](https://github.com/ljhwang); reviewed by [tjhei](https://github.com/tjhei)) [#5043](https://github.com/geodynamics/aspect/pull/5043): initialize current linearization point when we refine the mesh (implemented by [jdannberg](https://github.com/jdannberg); reviewed by [tjhei](https://github.com/tjhei)) [#5041](https://github.com/geodynamics/aspect/pull/5041): Fix ascii data initial for two merged chunks (implemented by [gassmoeller](https://github.com/gassmoeller); reviewed by [bangerth](https://github.com/bangerth)) And this is a list of recently opened or closed discussions: [#5071](https://github.com/geodynamics/aspect/issues/5071) Update Stokes preconditioner with free surface? (opened) [#5063](https://github.com/geodynamics/aspect/issues/5063) replace ParticleOutput by deal.II::Particle::DataOut (opened) [#5046](https://github.com/geodynamics/aspect/issues/5046) Issue on page /user/cookbooks/cookbooks/composition\_passive\_particles/doc/composition\_passive\_particles.html (closed) [#5042](https://github.com/geodynamics/aspect/issues/5042) “Allow fixed temperature on outflow boundaries = false” option does not work in time steps where mesh is refined (closed) [#5036](https://github.com/geodynamics/aspect/issues/5036) Impossible to run aspect on M1 Pro with MacOs Ventura (closed) [#4976](https://github.com/geodynamics/aspect/issues/4976) Incompatible ASPECT dev with deal.II dev from before #14167 (closed) [#4841](https://github.com/geodynamics/aspect/issues/4841) aspect 2.4.0 release (closed) 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! 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/).