Hi Devang,
In one sentence, yes you can use a network of computers running linux (Beowulf) passing tasks with mpirun using a machine file. These keywords should get you a few articles on a google search.
However, unless you have a fiber optic network I wouldn’t suggest that. You will be losing a lot of time in communication through the network, even with gigabit networks. I think I would first try and fit things in memory. I regularly use a similar set up (memory is the only real bottleneck) for quite demanding studies and I usually find ways to fit it. It’s not always ideal but with some trial and error you should be able to find some good compromise.
If you do think you’ll be running many CFD studies in the future, I’d invest a bit of money in 32gb more, when you can.