# Algorithms for solving transient turbulent models

**URL:** <https://www.simscale.com/forum/t/algorithms-for-solving-transient-turbulent-models/93216>\
**Category:** Fluid Flow / CFD\
**Created:** [June 24, 2021, 5:44pm UTC](https://www.simscale.com/forum/t/algorithms-for-solving-transient-turbulent-models/93216 "2021-06-24T17:44:39Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![vibhor\_gopal](https://www.simscale.com/forum/letter_avatar/vibhor_gopal/32/5_5575768a8748004e209b776fc1b2916d.png) [@vibhor\_gopal](https://www.simscale.com/forum/u/vibhor_gopal)\
**Post date:** [June 24, 2021, 5:44pm UTC](https://www.simscale.com/forum/t/algorithms-for-solving-transient-turbulent-models/93216/1 "2021-06-24T17:44:39Z")

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What is the difference between PIMPLE and PISO algorithms for solving transient problems using the k-omega-sst model? Would there be a significant variation in the results generated?

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**Author:** ![RicardoParis](https://www.simscale.com/forum/user_avatar/www.simscale.com/ricardoparis/32/30222_2.png) [@RicardoParis](https://www.simscale.com/forum/u/RicardoParis)\
**Post date:** [June 24, 2021, 6:34pm UTC](https://www.simscale.com/forum/t/algorithms-for-solving-transient-turbulent-models/93216/2 "2021-06-24T18:34:01Z")

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Hello!

Being very brief, if you have a PIMPLE algorithm operating with 1 outer corrector, then it would operate like a PISO algorithm. Typically, the PIMPLE algorithm will have improved stability over PISO (and it can also speed up simulations, if you push Courant over 1).

For a more detailed discussion, please refer to:

- [CFD: PIMPLE Algorithm](https://www.simscale.com/forum/t/cfd-pimple-algorithm/81418)
- [How To Set Up a Cost-Effective Transient Simulation - YouTube](https://www.youtube.com/watch?v=F47otBXGLG8)

Cheers