# Adapting the mAL preconditioner to stokes-fieldsplit-2d

**URL:** <https://community.freefem.org/t/adapting-the-mal-preconditioner-to-stokes-fieldsplit-2d/4041>\
**Category:** General Discussion\
**Created:** [August 15, 2025, 1:56pm UTC](https://community.freefem.org/t/adapting-the-mal-preconditioner-to-stokes-fieldsplit-2d/4041 "2025-08-15T13:56:36Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![AzizTakhirov](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/aziztakhirov/32/26_2.png) [@AzizTakhirov](https://community.freefem.org/u/AzizTakhirov)\
**Post date:** [January 26, 2026, 8:27pm UTC](https://community.freefem.org/t/adapting-the-mal-preconditioner-to-stokes-fieldsplit-2d/4041/3 "2026-01-26T20:27:11Z")

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I would like to understand the correct syntax for implementing this preconditioner. Of course, the end goal isn’t 2D Stokes, but 3D problems. Here is the code attached.

[stokes-fieldsplit-2d-PETSc\_bug.edp](https://community.freefem.org/uploads/short-url/1d57GMkFmZWPBaXWwlhRz9dWJH8.edp) (4.2 KB)

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