Learning Forum

[vikoviko3009]

Hi all, 

Im simulating the mixing of hydrogen and air in a 2d geometry and i want to compute and plot for each point of the grid the following ratio (see below), something like a contour plot. The mass flow rates are defined as integral over the area of density, normal velocity and mass fraction. How can I compute this?

 

[Rob]

Fluent has volume fraction data, and we also know the volume of a cell and it's density. You can then work out the mass of each species and from there the mass fraction. I'd use Custom Field Functions, but I suspect Expressions will also work. 

[vikoviko3009]

Thank you for the answer, but could you tell me how to asses the voulme fraction data?

[Rob]

In a calculation? Either in a Custom Field Function or an Expression: both are covered in the User's Guide.