... online1
http://panoramix.ift.uni.wroc.pl/$\sim$maq 
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... mail2
maq@panoramix.ift.uni.wroc.pl 
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... structure3
It is rather intuitive to use here a class hierarchy of vector - point - material point, but I decided to present c solution instead of c++. 
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... vector4
Normal vectors to springs will be needed in Pressure Force calculation subroutine. 
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... possible5
See [1] to get some ideas about enhancements in an implementation 
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... law6
If interested - please refer to any cloth / spring mass model to find derivation of that expression 
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... value7
We are not interested in exactly physics value of pressure, however if you are interested, you can derive it from fundamental physics principles, use Clausius-Clapeyron equation etc. 
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... dimensions)8
There were questions about $[N]$ in equation (2) - it is just a dimension of the force, here dimension is $[N]$ what means just Newton. Newton is a dimension of the force. 
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... Stam9
Jos S. develop real time smoke dynamics simulations. 
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... volume10
Actually in two dimensional case we are not talking about volume, but about figure field, but we I will call it volume, because of it relation to three dimensional soft body model. 
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... ODE11
Ordinary Differential Equation 
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