CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   Main CFD Forum (http://www.cfd-online.com/Forums/main/)
-   -   Capturing Large Variations using FINITE DIFFERENCE (http://www.cfd-online.com/Forums/main/1183-capturing-large-variations-using-finite-difference.html)

Yogesh Talekar August 20, 1999 06:32

Capturing Large Variations using FINITE DIFFERENCE
 
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?

John C. Chien August 20, 1999 12:21

Re: Capturing Large Variations using FINITE DIFFERENCE
 
(1). What is the problem you are trying to solve? (2). Based on your description, it is hopeless. You have both the accuracy problem and the stability problem. (3). It is a good idea to look for a working method first.


All times are GMT -4. The time now is 02:17.