# Examples for finding TW solutions with findsoln

**URL:** <https://discourse.channelflow.ch/t/examples-for-finding-tw-solutions-with-findsoln/89>\
**Category:** Usage\
**Created:** [March 22, 2020, 11:20pm UTC](https://discourse.channelflow.ch/t/examples-for-finding-tw-solutions-with-findsoln/89 "2020-03-22T23:20:13Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Sjter](https://avatars.discourse-cdn.com/v4/letter/s/f0a364/32.png) [@Sjter](https://discourse.channelflow.ch/u/Sjter)\
**Post date:** [March 22, 2020, 11:20pm UTC](https://discourse.channelflow.ch/t/examples-for-finding-tw-solutions-with-findsoln/89/1 "2020-03-22T23:20:13Z")

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I’ve been trying to obtain traveling wave solutions to plane Poiseuille flow using findsoln, but have been unable to get a converged solution. I was trying to obtain the results presented in “Exact coherent states and connections to turbulent dynamics in minimal channel flow”, by Park and Graham (2015), for example the P4-LB solution in figure 7(f).

Is anyone able to provide recommendations, and perhaps a working example, of how to find these solutions, and what parameters to use to optimise convergence?

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**Author:** ![jlangham](https://avatars.discourse-cdn.com/v4/letter/j/a88e4f/32.png) [@jlangham](https://discourse.channelflow.ch/u/jlangham)\
**Post date:** [March 30, 2020, 9:00am UTC](https://discourse.channelflow.ch/t/examples-for-finding-tw-solutions-with-findsoln/89/2 "2020-03-30T09:00:02Z")

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What have you tried so far?

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**Author:** ![Sjter](https://avatars.discourse-cdn.com/v4/letter/s/f0a364/32.png) [@Sjter](https://discourse.channelflow.ch/u/Sjter)\
**Post date:** [March 31, 2020, 1:07am UTC](https://discourse.channelflow.ch/t/examples-for-finding-tw-solutions-with-findsoln/89/3 "2020-03-31T01:07:37Z")

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Hi, I think I’ve finally figured it out. I was more or less trying the right things (run DNS with simulateflow to generate an initial guess, pick states that are close to the desired ECS state, and use findsoln). I just didn’t understand how to apply symmetries correctly.