How to active "3rd Order Upwind Monotonicity Preserving" ?

wind · February 18, 2012, 04:59

In flow-3D user site, I read a tip of choosing an Advection Method. it says:

IORDER=1 1st Order Momentum Advection
IORDER=2 2nd Order Centered
IORDER=3 2nd Order Upwind Monotonicity Preserving
IORDER=4 3rd Order Upwind Monotonicity Preserving

but in Flow-3D ver. 10.01, there is not "IORDER=4 3rd Order Upwind Monotonicity Preserving" at all. Even I change the value of iorder in prepin file, it doesn't appear when the prepin file is opened.

So I woul like to ask:

Is there really a "3rd Order Upwind Monotonicity Preserving" in the Flow-3D? and if, how to activate it? thanks!

melissa · February 21, 2012, 11:16

The IORDER=4 3rd Order Upwind Monotonicity Preserving was removed because it had not been correctly implemented near solid and mesh boundaries, and it would have been counter-productive to make it right. If it can be shown to be useful it may be added back in.

February 18, 2012, 04:59	How to active "3rd Order Upwind Monotonicity Preserving" ?	#1
wind New Member Join Date: Dec 2009 Posts: 6 Rep Power: 16	In flow-3D user site, I read a tip of choosing an Advection Method. it says: IORDER=1 1st Order Momentum Advection IORDER=2 2nd Order Centered IORDER=3 2nd Order Upwind Monotonicity Preserving IORDER=4 3rd Order Upwind Monotonicity Preserving but in Flow-3D ver. 10.01, there is not "IORDER=4 3rd Order Upwind Monotonicity Preserving" at all. Even I change the value of iorder in prepin file, it doesn't appear when the prepin file is opened. So I woul like to ask: Is there really a "3rd Order Upwind Monotonicity Preserving" in the Flow-3D? and if, how to activate it? thanks!

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February 21, 2012, 11:16		#2
melissa Member MC Join Date: Mar 2009 Posts: 56 Rep Power: 17	The IORDER=4 3rd Order Upwind Monotonicity Preserving was removed because it had not been correctly implemented near solid and mesh boundaries, and it would have been counter-productive to make it right. If it can be shown to be useful it may be added back in.