I am modelling a mixer, so it is a rotational flow. I am quite new to numerical modelling.

I need to find a way to measure the level of mixing within in the flow, i.e. how homogenous the mixture is.

I have found a definition which is a ratio vorticity and strain rate tensor, but I have to write a fortran code to calculate it....which is incredibly scary for me!!

I was wondering if there was another way of measuring mixedness without having to write a fortran code, or to calculate the mixedness using the strain rate and vorticity.

I am quite desperate here, so any suggestions would be welcome.

Also if I have calculates values in the post registers, whats the best way of extracting them?

Thanks

How are you modelling the flow? Pressumably it is two liquids, are you using VOF? Cant you just look at the scalar concentrations?

Sam, I am also interested in defining a measure for mixedness. I haven't found anything in the literature that looks useful for my problem. If you get some interesting responses would you please pass them on to me? Thanks. Bob