# Local hydrodynamic stability problem

**URL:** https://community.freefem.org/t/local-hydrodynamic-stability-problem/2990
**Category:** General Discussion
**Created:** [February 23, 2024, 12:59pm UTC](https://community.freefem.org/t/local-hydrodynamic-stability-problem/2990 "2024-02-23T12:59:21Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Amitkaush](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/amitkaush/32/1978_2.png) [@Amitkaush](https://community.freefem.org/u/Amitkaush)
#### Post date: [February 23, 2024, 12:59pm UTC](https://community.freefem.org/t/local-hydrodynamic-stability-problem/2990/1 "2024-02-23T12:59:21Z")

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I am trying to solve for local hydrodynamic stability for plane poiseuille flow (incompressible and viscous)  
I tried using meshL to create 1d domain but the A branch of the eigenvalue spectrum is not matching with the standard result.  
Can you help with the solver and tgv value that i should use?

Also is there a way to plot eigenvectors in matlab after finding them using eigs? the results given by the Eigenvalue function is not correct.