Defining volume fraction for three-phase VOF

darang · February 1, 2016, 17:24

Dear Colleagues,

I successfully ran the oscillation of a single phase droplet in air. Now I am trying to simulate the oscillation of a core-shell structured liquid droplet in air. The problem involves three phases: liquid 1 in the core, liquid 2 for shell, and finally air. I applied the same modeling strategy that I used for the two-phase problem, but it failed.

I guess there must be something not right dealing with volume fraction of three phases. For two phase system, I did not have to worry about volume fraction, as it varies from 0 to 1 and I patched liquid with volume fraction 1.

What must be added or modified (maybe UDF to define volume fraction function for the three phases), if I want to extend a two-phase model to a three-phase model in Fluent?

Could anyone kindly share your idea or experience (or an example) with me?

Thank you!

wangchengan2003 · February 21, 2018, 02:53

Dear friend,
I meet similiar problem of three phases like you. Have you found the solution?
Best regards,
Chengan

February 1, 2016, 17:24	Defining volume fraction for three-phase VOF	#1
darang New Member Jon Lee Join Date: Jun 2012 Posts: 6 Rep Power: 14	Dear Colleagues, I successfully ran the oscillation of a single phase droplet in air. Now I am trying to simulate the oscillation of a core-shell structured liquid droplet in air. The problem involves three phases: liquid 1 in the core, liquid 2 for shell, and finally air. I applied the same modeling strategy that I used for the two-phase problem, but it failed. I guess there must be something not right dealing with volume fraction of three phases. For two phase system, I did not have to worry about volume fraction, as it varies from 0 to 1 and I patched liquid with volume fraction 1. What must be added or modified (maybe UDF to define volume fraction function for the three phases), if I want to extend a two-phase model to a three-phase model in Fluent? Could anyone kindly share your idea or experience (or an example) with me? Thank you! Last edited by darang; February 1, 2016 at 18:27.

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February 21, 2018, 02:53		#2
wangchengan2003 Member chengan.wang Join Date: Jan 2016 Location: china Posts: 47 Rep Power: 10	Dear friend, I meet similiar problem of three phases like you. Have you found the solution? Best regards, Chengan