About The Basic Theory of The Differential Equations on The Ships Problem

I found a very interesting sentence from my college teacher facebook status update today. He is Mr Petrus Eko Panunggal. He talked about the basic theory of the differential equations on the ships problem. I think that sentence is very important for every naval architecture students.

So, this is Mr Eko's facebook status update today.
Mr Eko says : "If you are using FEM (in Ansys or somewhere else) you are solving differential equations to find your stresses. If you are using CFD (in Ansys or somewhere else) you are solving differential equations to find your pressure etc. If you are using Moses (or anything similar) you are solving differential equations to find your motion, speed, accelerations etc. If you are calculating the plate thickness (using BKI or other rules) you are solving the differential equations to find your stresses etc. If you are using Holtrop, you are using statistics to estimate the resistance of you ship."

The differential equations are used to model the actual world. The question is: Is your model close enough to the actual thing? To discover something new is something else

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