# TOMAWAC v8p3

**URL:** <https://opentelemac.org/forum/t/tomawac-v8p3/6982>\
**Category:** TOMAWAC\
**Created:** [September 13, 2022, 8:40am UTC](https://opentelemac.org/forum/t/tomawac-v8p3/6982 "2022-09-13T08:40:20Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![user\_15422](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/ea5d25/32.png) [@user\_15422](https://opentelemac.org/forum/u/user_15422)\
**Post date:** [September 13, 2022, 8:40am UTC](https://opentelemac.org/forum/t/tomawac-v8p3/6982/1 "2022-09-13T08:40:20Z")

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Dear [name removed]

I updated Tomawac from v7p2 to v8p3.

When I run my cases with the new version, I obtain a lot of instabilities in the surf zone that I haven’t in v7p2.

Did you get the same problems? How do you solve them?

[name removed]

Cerema Med

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<div class="post-metadata">

**Author:** ![user\_8473](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/8c91f0/32.png) [@user\_8473](https://opentelemac.org/forum/u/user_8473)\
**Post date:** [September 13, 2022, 12:40pm UTC](https://opentelemac.org/forum/t/tomawac-v8p3/6982/2 "2022-09-13T12:40:35Z")

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Hello

Differences between V7P2 and V8P3 should not bring any instabilities.

Did you check that your fortran user have the right number of arguments ? Some changes on this side have been made between the 2 versions.

Hope it helps

T [name removed]