Quote:
Originally Posted by fika84
Simple compared to what? Multi-body dynamics is difficult enough and fluid dynamics is even more difficult IMO with so many partial derivatives and long convoluted equations (also have a BS in Mechanical Engineering). We were always taught to NEVER trust software if you can't do a "simple" hand calculation to back it up. Software makes things easier/quicker to not only get answers, but to get WRONG answers if you messed up.
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I didn't mean anything offensive by it, all that I meant was that from a theory perspective, you have an initial state, a set of governing equations (navier stokes), and all you do from that point on is solve them. I can certainly appreciate the practical complexities of that last step, and I didn't mean to trivialize it in any way.
As an applied mathematician I can sympathize with having a certain level of distrust for numerical methods, especially when applied to chaotic non-linear equations. But I am surprised to hear that as an engineer you actually solve your own PDEs.
If you have done any work with applied FD, how do you go about solving problems? Do you actually try to simplify navier stokes and solve them in closed form? I assumed it was more like, throw rk4 at it and call it a day. Or even, throw 'software' at it and call it a day.