# \#quasi-newton

**URL:** https://precice.discourse.group/tag/quasi-newton/34.md

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## [Highlights of the new preCICE release v3.4](https://precice.discourse.group/t/highlights-of-the-new-precice-release-v3-4/2932)

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**Author:** [@uekerman](https://precice.discourse.group/u/uekerman)\
**Replies:** 0\
**Last updated:** [April 23, 2026, 10:59am UTC](https://precice.discourse.group/t/highlights-of-the-new-precice-release-v3-4/2932 "2026-04-23T10:59:00Z")

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Summary: With preCICE v3.4, we pushed features on several fronts. We made quasi-Newton acceleration bounds-aware as a first step toward fully supporting bounded coupling variables, such as density or volume ratio. Partit…

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## [Stabilizing the Turek/Hron FSI3 Benchmark with IQN-IMVJ](https://precice.discourse.group/t/stabilizing-the-turek-hron-fsi3-benchmark-with-iqn-imvj/2600)

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**Author:** [@nicolaslesquoy](https://precice.discourse.group/u/nicolaslesquoy)\
**Replies:** 5\
**Last updated:** [January 20, 2026, 7:11pm UTC](https://precice.discourse.group/t/stabilizing-the-turek-hron-fsi3-benchmark-with-iqn-imvj/2600 "2026-01-20T19:11:55Z")

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I recently ran into difficulties while trying to stabilize the Turek/Hron FSI3 benchmark using an implicit parallel coupling scheme with the IQN-IMVJ acceleration method in preCICE. Interestingly, the setup works flawles…

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## [What do the API methods in "Step 6 – Implicit coupling" do exactly?](https://precice.discourse.group/t/what-do-the-api-methods-in-step-6-implicit-coupling-do-exactly/1365)

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**Author:** [@hongwuw](https://precice.discourse.group/u/hongwuw)\
**Replies:** 3\
**Last updated:** [April 26, 2023, 7:05am UTC](https://precice.discourse.group/t/what-do-the-api-methods-in-step-6-implicit-coupling-do-exactly/1365 "2023-04-26T07:05:23Z")

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I have 4 questions regarding: Step 6 – Implicit coupling (Step 6 – Implicit coupling | preCICE - The Coupling Library) (I use the two figures from your website to describe my questions. One figure is the “Fixed time win…

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## [Changing the acceleration method in the middle of the simulation](https://precice.discourse.group/t/changing-the-acceleration-method-in-the-middle-of-the-simulation/1237)

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**Author:** [@PreGMjr](https://precice.discourse.group/u/PreGMjr)\
**Replies:** 5\
**Last updated:** [December 19, 2022, 2:26pm UTC](https://precice.discourse.group/t/changing-the-acceleration-method-in-the-middle-of-the-simulation/1237 "2022-12-19T14:26:24Z")

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Is this possible, to change the method of acceleration for the coupling after a certain time instant. Should different precice-configure.xml files be created ? Thank you in advance !

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## [Understanding the (mis)behavior of IMVJ](https://precice.discourse.group/t/understanding-the-mis-behavior-of-imvj/341)

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**Author:** [@ajaust](https://precice.discourse.group/u/ajaust)\
**Replies:** 7\
**Last updated:** [October 7, 2020, 12:38pm UTC](https://precice.discourse.group/t/understanding-the-mis-behavior-of-imvj/341 "2020-10-07T12:38:24Z")

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I am currently running a parameter study for test case where I compare different accelerators paired with different filters, filter sensitivities and accelerator specific settings. At the moment I am especially intereste…