# A higher BDM element in Freefem **URL:** \ **Category:** General Discussion\ **Created:** [June 8, 2023, 1:47pm UTC](https://community.freefem.org/t/a-higher-bdm-element-in-freefem/2531 "2023-06-08T13:47:01Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![junjie](https://avatars.discourse-cdn.com/v4/letter/j/278dde/32.png) [@junjie](https://community.freefem.org/u/junjie)\ **Post date:** [June 8, 2023, 1:47pm UTC](https://community.freefem.org/t/a-higher-bdm-element-in-freefem/2531/1 "2023-06-08T13:47:01Z")
Hello everyone. I’m trying to solve the Stokes equations with BDM element in Freefem. However, there seems to be only BDM1 element. It’s so frustrating. Because I want to verify the convergence-order of the error with a higher BDM element. Is there any other way to use a higher BDM element? Thank you for your help！ ---
**Author:** ![marchywka](https://avatars.discourse-cdn.com/v4/letter/m/ee59a6/32.png) [@marchywka](https://community.freefem.org/u/marchywka)\ **Post date:** [June 8, 2023, 2:50pm UTC](https://community.freefem.org/t/a-higher-bdm-element-in-freefem/2531/2 "2023-06-08T14:50:08Z")
Apparently implementation is not trivial. For example, this from circa 2009 posted earlier mentions FF at the time, > **[1205.3085.pdf](https://arxiv.org/pdf/1205.3085.pdf)** > > 431.44 KB maybe someone has a better more current ref on the issues. ---
**Author:** ![junjie](https://avatars.discourse-cdn.com/v4/letter/j/278dde/32.png) [@junjie](https://community.freefem.org/u/junjie)\ **Post date:** [June 9, 2023, 12:45am UTC](https://community.freefem.org/t/a-higher-bdm-element-in-freefem/2531/3 "2023-06-09T00:45:49Z")
Ok, I’ll read this article carefully. Thank you for your reply！ ---
**Author:** ![frederichecht](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/frederichecht/32/15_2.png) [@frederichecht](https://community.freefem.org/u/frederichecht)\ **Post date:** [June 10, 2023, 9:46am UTC](https://community.freefem.org/t/a-higher-bdm-element-in-freefem/2531/4 "2023-06-10T09:46:19Z")
Yes, I know, If you have time to code : a papier on this subject: > **[erv112.pdf](https://cecas.clemson.edu/~vjervin/papers/erv112.pdf)** > > 322.08 KB and the DOF is defini here: > **[DefElement: Brezzi–Douglas–Marini](https://defelement.com/elements/brezzi-douglas-marini.html)** > > An encyclopedia of finite element definitions This is more than a half day coding for me, I can help you. ---
**Author:** ![junjie](https://avatars.discourse-cdn.com/v4/letter/j/278dde/32.png) [@junjie](https://community.freefem.org/u/junjie)\ **Post date:** [June 10, 2023, 11:03am UTC](https://community.freefem.org/t/a-higher-bdm-element-in-freefem/2531/5 "2023-06-10T11:03:53Z")
Wow！I would appreciate it if you could help me implement the code！Thank you！