Consider a box divided into two equal
halves separated by a wall with a hole through which particle exchange can take
place. It is assumed that only one particle can pass through the hole per unit
time. Let there be total N particles and assume that at t = 0,
all the particles are on left side. (ie at t = 0, nl=N
and Nr = 0). Once the hole is opened, particle exchange takes
place and it continues till the equilibrium is reached. The system can be simulated
with a simple statistical model. In order to simulate when N>>1,
we assume that, all the particles have equal probability of crossing the wall.
So probability of particle moving from left to right is Nl/N
and right to left is Nr/N. Once the physical system is
represented in probability function, application of Monte – Carlo method is
straight forward. In code, it compares Monte – Carlo result with analytic
solution,
References:
1.
Computational physics – An introduction, Verma, R C, Ahluwalia, P K,
Sharma, K C, New Age International (P) Limited, Publishers (2005)
2.
Computational Physics, Richard Fitzpatrick Professor
of Physics, University of Texas at Austin
3.
Computational Physics, M. Hjorth
– Jensen, Department of Physics, University of Oslo (2003)
nice one
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