[Other] Smoothness of derivatives at node points

Hillie · January 16, 2016, 22:32

Dear Foamers

The mesh that I am working with involves a line segment, followed by an arc, and then an other line. I have positioned the points that link the lines with the arc segment in such a way that there should be smooth and continuous transition of the first and second derivative.

I get a first derivative that looks oke, but there is a distinct jump in the second derivative, which also shows up in the flow solution.

Does anybody know if there is a way that I can force the derivatives to be smooth on the link point?

Cheers

Artur · March 12, 2016, 11:04

I think it would help everyone if you posted some pictures of the problem you're describing? I take it you're using block mesh with arc and line edges, if yes then I'm afraid you cannot control the derivatives of these. You could try the spline edge, which potentially gives you a bit more flexibility.

A

January 16, 2016, 22:32	Smoothness of derivatives at node points	#1
Hillie Member Hilbert Join Date: Aug 2015 Location: Australia Posts: 50 Rep Power: 10	Dear Foamers The mesh that I am working with involves a line segment, followed by an arc, and then an other line. I have positioned the points that link the lines with the arc segment in such a way that there should be smooth and continuous transition of the first and second derivative. I get a first derivative that looks oke, but there is a distinct jump in the second derivative, which also shows up in the flow solution. Does anybody know if there is a way that I can force the derivatives to be smooth on the link point? Cheers

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March 12, 2016, 11:04		#2
Artur Senior Member Artur Join Date: May 2013 Location: Southampton, UK Posts: 372 Rep Power: 19	I think it would help everyone if you posted some pictures of the problem you're describing? I take it you're using block mesh with arc and line edges, if yes then I'm afraid you cannot control the derivatives of these. You could try the spline edge, which potentially gives you a bit more flexibility. A