April 27, 2022 at 4:22 pmRomariodeSubscriber
I am working on a Biogas project where the equations to be solved are the continuity equation and momentum equation
I have done the geometry in SpaceClaim, mesh in Fluent with fluent meshing, and switched to the solution part. In the Setup under Named expressions, I need to have the two equations as shown below. how can I do this ?
Below are screenshots of my progressApril 28, 2022 at 1:48 pmRobForum ModeratorYou'll probably want turbulence and species too. Staff are not permitted to open attachments so please repost the images. However, expressions are covered in the User's Guide, click on Help in Fluent and explore.
April 28, 2022 at 1:54 pmApril 28, 2022 at 2:11 pmSwathi V. V.Ansys EmployeeHi Please refer to the link below to
Create named expression: 5.3.2. Named Expressions (ansys.com)
Turbulence modelling : Chapter 13: Modeling Turbulence (ansys.com)
Species Transport : 15.1. Modeling Species Transport and Finite-Rate Chemistry (ansys.com)
April 28, 2022 at 2:15 pmRobForum ModeratorYou may want to rethink the choice of VOF, and how you've defined the phases too.
April 28, 2022 at 2:24 pmApril 28, 2022 at 2:39 pmRobForum ModeratorIf you want to model the free surface then VOF is the correct choice. If you want to just look at the gas side then use a bio-gas + air species mixture. Either way, you have one liquid phase and one gas phase.
April 28, 2022 at 3:34 pmApril 28, 2022 at 4:17 pmRobForum ModeratorOK, so water enters and evolves biogas? Where is the air, or is that present to start with?
April 28, 2022 at 4:54 pmRomariodeSubscriberYes, Water enters and evolves biogas. Liquid Water is used to simulate the flow field here since biogas slurry is a low concentration solution at the initial stages of biogas fermentation and also it has flow liquidity that is similar to that of water. In this test, the slurry is assumed to obey the continuity and momentum conservation equations.
Air is present in the dome initially.
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