# ASPECT Newsletter #200 **URL:** \ **Category:** ASPECT\ **Created:** [July 22, 2024, 10:00am UTC](https://community.geodynamics.org/t/aspect-newsletter-200/3560 "2024-07-22T10:00:18Z")\ **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:** [July 22, 2024, 10:00am UTC](https://community.geodynamics.org/t/aspect-newsletter-200/3560/1 "2024-07-22T10:00:18Z")
Hello everyone! This is ASPECT newsletter #200. 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: [#5982](https://github.com/geodynamics/aspect/pull/5982): Use effective strain rate in viscoplastic stress limiter case as well (implemented by [anne-glerum](https://github.com/anne-glerum); reviewed by [bobmyhill](https://github.com/bobmyhill)) [#5981](https://github.com/geodynamics/aspect/pull/5981): Only use reference strain rate during the first nonlinear iteration in viscoplastic material model (implemented by [anne-glerum](https://github.com/anne-glerum)) [#5978](https://github.com/geodynamics/aspect/pull/5978): Changed Newton iteration to log-log iteration in CompositeViscoPlastic (implemented by [bobmyhill](https://github.com/bobmyhill)) [#5977](https://github.com/geodynamics/aspect/pull/5977): enforce approx peierls in composite viscoplastic (implemented by [bobmyhill](https://github.com/bobmyhill); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5976](https://github.com/geodynamics/aspect/pull/5976): Add DruckerPragerPower rheology (implemented by [bobmyhill](https://github.com/bobmyhill); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5975](https://github.com/geodynamics/aspect/pull/5975): Use std::system instead of ::system. (implemented by [bangerth](https://github.com/bangerth); reviewed by [bobmyhill](https://github.com/bobmyhill)) [#5974](https://github.com/geodynamics/aspect/pull/5974): Test that manager classes fill both base class member variables consistently. (implemented by [bangerth](https://github.com/bangerth); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5973](https://github.com/geodynamics/aspect/pull/5973): improve docs for drucker prager (implemented by [bobmyhill](https://github.com/bobmyhill); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5972](https://github.com/geodynamics/aspect/pull/5972): add grain size to composite viscoplastic (implemented by [bobmyhill](https://github.com/bobmyhill); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5971](https://github.com/geodynamics/aspect/pull/5971): Use pressure consistently for viscous creep in visco-plastic (implemented by [gassmoeller](https://github.com/gassmoeller); reviewed by [bobmyhill](https://github.com/bobmyhill)) [#5970](https://github.com/geodynamics/aspect/pull/5970): Add option to use adiabatic pressure to determine yield stress in visco plastic rheology (implemented by [gassmoeller](https://github.com/gassmoeller)) [#5969](https://github.com/geodynamics/aspect/pull/5969): cookbook for a temperature field from an ascii file (implemented by [Francyrad](https://github.com/Francyrad)) [#5968](https://github.com/geodynamics/aspect/pull/5968): Adds new publications (implemented by [ljhwang](https://github.com/ljhwang); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5966](https://github.com/geodynamics/aspect/pull/5966): Create a dedicated type to denote something invalid. (implemented by [bangerth](https://github.com/bangerth); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5965](https://github.com/geodynamics/aspect/pull/5965): Use a variable in the base class instead of local ones. (implemented by [bangerth](https://github.com/bangerth); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5964](https://github.com/geodynamics/aspect/pull/5964): Use emplace\_back() over push\_back(). (implemented by [bangerth](https://github.com/bangerth); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5963](https://github.com/geodynamics/aspect/pull/5963): support different compositions with particles (implemented by [tjhei](https://github.com/tjhei)) [#5962](https://github.com/geodynamics/aspect/pull/5962): Deprecate Manager functions now available through the base class. (implemented by [bangerth](https://github.com/bangerth); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5960](https://github.com/geodynamics/aspect/pull/5960): allow variable grain size in diffusion creep (implemented by [bobmyhill](https://github.com/bobmyhill); reviewed by [gassmoeller](https://github.com/gassmoeller)) [#5902](https://github.com/geodynamics/aspect/pull/5902): Add fluid velocity postprocessor (implemented by [danieldouglas92](https://github.com/danieldouglas92); reviewed by [gassmoeller](https://github.com/gassmoeller)) And this is a list of recently opened or closed discussions: [#5983](https://github.com/geodynamics/aspect/issues/5983) Test viscoplastic material model (opened) [#5980](https://github.com/geodynamics/aspect/issues/5980) Deformed cell for 3D mesh deformation in release mode (opened) [#5979](https://github.com/geodynamics/aspect/issues/5979) An error and its solution “bash: /home/ubuntu/aspect/aspect: No such file or directory” (opened) [#5967](https://github.com/geodynamics/aspect/issues/5967) Update to particle composition (opened and closed) [#5961](https://github.com/geodynamics/aspect/issues/5961) Modify Stress limiter in VP? (opened) 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/).