{"id":159888,"date":"2021-06-27T11:10:58","date_gmt":"2021-06-27T11:10:58","guid":{"rendered":"\/forum\/forums\/topic\/vof-does-not-show-a-sharp-interface\/"},"modified":"2021-06-28T16:32:30","modified_gmt":"2021-06-28T16:32:30","slug":"vof-does-not-show-a-sharp-interface","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/vof-does-not-show-a-sharp-interface\/","title":{"rendered":"VOF does not show a sharp interface"},"content":{"rendered":"
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Hi everyone,<\/p>\n

I am trying to simulate the natural evaporation of a thin water film. Basically, there is dry air passing through above the water liquid film, and the water liquid is expected to evaporate into the dry air.<\/p>\n

I used VOF and enabled the sharp interface and interfacial anti-diffusion, as well the evaporation-condensation Lee model.<\/p>\n

However, as the picture shows, the interface between the water liquid and the air (the air is the mixture of water vapour and dry air) is not "sharp" at all. Instead, there is a gradient of volume fraction of water liquid. How could this be? I expected the interface should only occupy one layer of cells, which mean except for one layer of cells, other cells should be either 0 volume fraction of water liquid or 1 volume fraction.<\/p>\n

Could somebody please help? Thanks<\/p>\n

Regards<\/p>\n

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