Can anyone please guide me how to use Monte Carlo Simulations. Whats the input format and how to use it. Also, how the results can be interpreted and what is a freeware software that can easily so the same on Windows 10.
Monte Carlo simulations is a widely used techniques these days, and certainly in ohysics and chemistry of fluids (in the bulk or near an interface) such simulations are accepted as gold standard. I am more familiar with the techniques involved in simulation of fluids. Perhaps the best practical reference I can cite is the book of Allen and Tylsdeley on Computer simulation of liquids. The exact title might be slightly different though.
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Please first mention about your research interests and your aim to apply MC simulations. In this way, your question will be much more suitable to discuss.
It seems that you have not quite understood what "Monte Carlo Simulation" actually is.
Say, you have a system that can go into 3 different states, with a probability of 50%, 30% and 20%. The only condition is that all probabilities have to add to 100%.
Then you let the computer calculate a (pseudo-) random number r, these are usually in the range of 0..1. The name "Monte Carlo" actually comes from this randomness, after the famous casino.