|January 31, 2005, 03:44||
A simple question
I have a very simple thing to ask...
I am using 6th order central difference scheme....for a partial difference term, say it includes 12 points (6 right side of the point and 6 left of it). It is fine while we have sufficient number of points both the sides. However, when we approach a boundary, we are not having sufficient points on one of the sides....and thats why we take ghost-cells on other side of the boundary....
my question is:
1. how many ghost cells do we need to consider??? Well, I think it should be 6. If I am wrong, please suggest me something in this regard.
2. Lets say, only 2 ghost cells have been taken. It is always possible to achieve the same level of 6th order accuracy if we take 10 points on interior side along with the 2 ghost points outside (10+2 = 12). Is there anything wrong in it??
thanks in anticipation!!
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