Capturing Large Variations using FINITE DIFFERENCE -- CFD Online Discussion Forums

August 20, 1999, 06:32	Capturing Large Variations using FINITE DIFFERENCE	#1
Yogesh Talekar Guest Posts: n/a	Hello "Gurus", I am doing a 1-D flow using finite difference in Conservation forms. There are quite a large variations in density and velocity expected towards the END side. And boundary values are calculated using LINEAR EXTRAPOLATION. The program develops HUGE VALUES of density and velocity and goes unstable towards the BOUNDARY END-SIDE. Other grid points away from boundary are OKEY. Shall I increase the grid-size or REDUCE the time-step? Can anybody help?

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