# OSG capability: multiphase unstaurated flow to simulate NAPL transport

**URL:** <https://discourse.opengeosys.org/t/osg-capability-multiphase-unstaurated-flow-to-simulate-napl-transport/937>\
**Category:** Help & Support\
**Created:** [January 11, 2022, 11:27am UTC](https://discourse.opengeosys.org/t/osg-capability-multiphase-unstaurated-flow-to-simulate-napl-transport/937 "2022-01-11T11:27:36Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![iaborsi](https://discourse.opengeosys.org/user_avatar/discourse.opengeosys.org/iaborsi/32/842_2.png) [@iaborsi](https://discourse.opengeosys.org/u/iaborsi)\
**Post date:** [January 11, 2022, 11:27am UTC](https://discourse.opengeosys.org/t/osg-capability-multiphase-unstaurated-flow-to-simulate-napl-transport/937/1 "2022-01-11T11:27:36Z")

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Hi All,  
I’m just approaching OGS for the 1st time, but reading the documentation I don’t understand if the following problem can be solved by OSG: transport of NAPL (non-aqueous phase liquid) in unsaturated or variably saturated conditions. Namely, a problem involving liquid (oil+water) and gas (air).  
Just in case, is there any working example of such a problem (or simething similar to that)?  
Any help will be really appreciated.  
Thansk in advance.  
Iacopo

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**Author:** ![boyanmeng](https://discourse.opengeosys.org/user_avatar/discourse.opengeosys.org/boyanmeng/32/535_2.png) [@boyanmeng](https://discourse.opengeosys.org/u/boyanmeng)\
**Post date:** [January 13, 2022, 8:04pm UTC](https://discourse.opengeosys.org/t/osg-capability-multiphase-unstaurated-flow-to-simulate-napl-transport/937/2 "2022-01-13T20:04:39Z")

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Hi Iacopo,

thanks for your interest in OGS multiphase flow.

Unfortunately, it is only possible to simulate two-phase flow with OGS at the moment. An example involving NAPL and water transport can be found [here](https://www.opengeosys.org/docs/benchmarks/two-phase-flow-pp-form/two-phase-flow-pp-mcwhorter/)

Kind regards,  
Boyan

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**Author:** ![iaborsi](https://discourse.opengeosys.org/user_avatar/discourse.opengeosys.org/iaborsi/32/842_2.png) [@iaborsi](https://discourse.opengeosys.org/u/iaborsi)\
**Post date:** [January 14, 2022, 10:37am UTC](https://discourse.opengeosys.org/t/osg-capability-multiphase-unstaurated-flow-to-simulate-napl-transport/937/3 "2022-01-14T10:37:09Z")

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Thanks Boyan.  
Iacopo