||April 11, 2012 22:13
Originally Posted by kingjewel1
So are you saying that it's not really worth any extra effort because the result is still just a rough outline of reality anyway?
Then why do I do grid independence studies if I'm going to end up converging to a solution that's probably BS to start with?
And hence it's extremely difficult to draw any legitimate conclusions from this type of CFD?:(
I'm not saying that it is a rough outline of reality (although in reality it is). I'm saying, adding these extra fine little details would not change your solution (much). So do you really want to put the extra effort into changing your solution by a few %? If you do, go ahead. If not, then why not just accept that there is a small error? From the beginning, the fluid model is only a model (we have already made many grand assumptions before even starting CFD, we have already made them when we called matter a fluid).
We make these assumptions and simplifications in order to get rid of the unnecessary details so that we can perform analysis and get meaningful results. Now, if you can keep all the details and still get the analysis done, then more power to you.
I am not saying that it is difficult to make legitimate assumptions. I am saying the opposite; it is much simpler to make legitimate conclusions by making assumptions! So why make your life more difficult?