Evaporation boundary condition at liquid-vapor iterface

vidyadhar · September 24, 2018, 10:00

Hi,

I am using Fluent to simulate evaporation of liquid into air in a vertical channel. I am trying to follow the below sequence:

1. VOF simulation without enabling energy equation to get a steady meniscus shape of liquid-vapor interface.

2. Now, I want to extract the obtained profile of the meniscus and apply evaporation or convective boundary condition on the meniscus/interface surface (after enabling the energy equation)

My queries:
a) How to extract the profile of the meniscus of liquid-vapor interface?

b) How to apply boundary condition on the meniscus which is fixed at a location?

Thanks in advance!

vidyadhar · September 26, 2018, 07:26

I have done this way:

a) An iso-value of 0.5 for liquid-phase has resulted in meniscus shape

b) Cells with iso-values for liquid-phase are marked using ''Mark/Adapt Cells'' option- this results in generation of a Register; With this Register face/cell zones are separated using "seperate faces/cells" - this results in formation of new cell zones, on which boundary conditions can be applied.

Source: Fluent user manual

September 24, 2018, 10:00	Evaporation boundary condition at liquid-vapor iterface	#1
vidyadhar Senior Member vidyadhar Join Date: Jul 2016 Posts: 138 Rep Power: 10	Hi, I am using Fluent to simulate evaporation of liquid into air in a vertical channel. I am trying to follow the below sequence: 1. VOF simulation without enabling energy equation to get a steady meniscus shape of liquid-vapor interface. 2. Now, I want to extract the obtained profile of the meniscus and apply evaporation or convective boundary condition on the meniscus/interface surface (after enabling the energy equation) My queries: a) How to extract the profile of the meniscus of liquid-vapor interface? b) How to apply boundary condition on the meniscus which is fixed at a location? Thanks in advance!

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September 26, 2018, 07:26		#2
vidyadhar Senior Member vidyadhar Join Date: Jul 2016 Posts: 138 Rep Power: 10	I have done this way: a) An iso-value of 0.5 for liquid-phase has resulted in meniscus shape b) Cells with iso-values for liquid-phase are marked using ''Mark/Adapt Cells'' option- this results in generation of a Register; With this Register face/cell zones are separated using "seperate faces/cells" - this results in formation of new cell zones, on which boundary conditions can be applied. Source: Fluent user manual