As far as I know, using Ansys Fluent you can take into account the surface tension forces between liquids using the VOF model.

To take into account the surface tension force in the calculation, you need to enable the "Surface Tension Force Modeling" option in the VOF model settings.

Also you will need to set the "Surface Tension Coefficient". This is a physical parameter and therefore it should be known to you based on what exactly makes up your mixture. And finally you will need to choose a model for accounting for surface tension forces. Ansys Fluent has two such models: "Continuous surface Force" or "Continuous surface Stress"

I have attached a pdf file with a presentation describing the VOF model in the Ansys Fluent. Directly about the surface tension is described on pages 15-18 .

There is also a step-by-step tutorial about modeling a VOF model. You can download it from the link below (it is too big and does not fit directly into the message). You need the example described in "Chapter 19: Using the VOF Model".

You can download the tutorial and the source files for completing tasks from here:

https://disk.yandex.ru/d/11hKviquwONmdg

The theoretical foundations of surface tension modeling in Ansys Fluent are described in the Ansys Fluent Theory Guide in Chapter 14.3.9. Surface Tension and Adhesion on page 589. You can download it from here:

https://disk.yandex.ru/i/UPPgCOVMsGuplw

I hope this helps you.

Thank you for your suggestion Vladimir Dorofeev .

I know about surface tension force modelling option where I can incorporate the surface tension coefficient. But my question is that when I am working with multifluid simulation, I need to incorporate the surface tension coefficient of two individual fluid at a time.

Suppose I have a fluid A and a fluid B, and I know their individual surface tension. But I don't know how to calculate the interfacial tension between both the fluids. There are many equations like "Youngs equation"," neumann equation" etc. but they are mostly used to calculate the interfacial surface tension between a solid and a liquid. My question is how to find the interfacial tension between 2 liquids.

Can you help me out regarding this?

Thank You in advance.

The VOF model is the model for multi fluid simulation. This model calculates the surface tension at the interface of the two phases. If you open Ansys Fluent, you will see that when setting the surface tension, it says "Phase-Pairs".

You wrote yourself what you need to model : "...where multifluid has been taken as discrete phase and 1 continuous phase..".

Such a case should be modeled using the VOF model. In Ansys Fluent you need to create a mixture where Primiry Phase will be your continuous fluid; Secondary Phase will be discrete phase. You set the surface tension coefficient by the discrete phase because it is discrete and therefore has a free form. The continuous phase has no surface tension coefficient, because it is continuous therefore has no free form.

VOF model is your case ("...where multifluid has been taken as discrete phase and 1 continuous phase...")