Stefan, This is because a Chrono simulation is possibly more than just multibody dynamics. The necessary error estimates for step size control would need to take into account all potential physics. Furthermore, most simulations of interest involve collision and contact. The collision detection is best done at constant time steps and that introduces additional constraints on the integration step size. What I did implement in HHT is a simple time adaptivity within the Chrono step size (controlled by the user and defining the frequency for collision detection). Granted, that doesn’t work always that great. Having said that, we plan on making some (somewhat unrelated) changes to the implicit time integrators and I will then revisit the time adaptivity issue as well.
--Radu From: projectchrono@googlegroups.com <projectchrono@googlegroups.com> On Behalf Of Stefan Oberpeilsteiner Sent: Thursday, September 26, 2024 10:33 PM To: ProjectChrono <projectchrono@googlegroups.com> Subject: [chrono] Step-size selection in HHT Timestepper I spent some time studying the HHT time stepping and I am wondering why the step-size selection published in „On the Use of the HHT Method in the Context of Index 3 DAE of MBD“ 2005 is not used within Project::Chrono. Is there any special disadvantage that comes with this step-size selection method. Stefan -- You received this message because you are subscribed to the Google Groups "ProjectChrono" group. To unsubscribe from this group and stop receiving emails from it, send an email to projectchrono+unsubscr...@googlegroups.com<mailto:projectchrono+unsubscr...@googlegroups.com>. To view this discussion on the web visit https://groups.google.com/d/msgid/projectchrono/80627c22-65f1-479b-812d-efe2f6afc6cdn%40googlegroups.com<https://urldefense.com/v3/__https:/groups.google.com/d/msgid/projectchrono/80627c22-65f1-479b-812d-efe2f6afc6cdn*40googlegroups.com?utm_medium=email&utm_source=footer__;JQ!!Mak6IKo!JwbdbYbo1jHgWRtJOUzLJ_yzGCA3mRUPNFJzsb6Aa88DBzgmMZhasbIo8eDMtDbaxojtnf_aKZ3q9QJlU1EbL_we4Q$>. -- You received this message because you are subscribed to the Google Groups "ProjectChrono" group. To unsubscribe from this group and stop receiving emails from it, send an email to projectchrono+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/projectchrono/CH3PPF46CDC21855C42DA7D2E4C801243B9A72B2%40CH3PPF46CDC2185.namprd06.prod.outlook.com.
