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<blockquote data-quote="AbdulAlhazred" data-source="post: 9027151" data-attributes="member: 82106">Well, from a PRACTICAL standpoint, simulations, that is models plus state, are generally incomplete. While this is, again practically, a kind of 'feature' it is not a basis upon which they acquire utility. Were I to be able to perfectly simulate the World's weather 3 days in advance by pure brute force application of processing power to a complete model and state, nobody would argue that 'fundamentally' this is a bad simulation. Quite the contrary! Obviously they wouldn't like the electricity bill though....Thinness ABSOLUTELY IS an issue, it is THE issue, an utterly insurmountable issue. To not understand that is to fundamentally not understand how a model has to be constrained, how it has to have enough of the relevant data to even conjecture about what might take place next. Yes, there are very simple models out there, like the simple 1D atmosphere models, and they can provide a very general answer to very specific questions, but they don't PREDICT much of anything at all. Calling them 'simulations' is just reducing the word to nothing.</blockquote>

[QUOTE="AbdulAlhazred, post: 9027151, member: 82106"] Well, from a PRACTICAL standpoint, simulations, that is models plus state, are generally incomplete. While this is, again practically, a kind of 'feature' it is not a basis upon which they acquire utility. Were I to be able to perfectly simulate the World's weather 3 days in advance by pure brute force application of processing power to a complete model and state, nobody would argue that 'fundamentally' this is a bad simulation. Quite the contrary! Obviously they wouldn't like the electricity bill though.... Thinness ABSOLUTELY IS an issue, it is THE issue, an utterly insurmountable issue. To not understand that is to fundamentally not understand how a model has to be constrained, how it has to have enough of the relevant data to even conjecture about what might take place next. Yes, there are very simple models out there, like the simple 1D atmosphere models, and they can provide a very general answer to very specific questions, but they don't PREDICT much of anything at all. Calling them 'simulations' is just reducing the word to nothing. [/QUOTE]

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