beginner level - CG oscillations -- CFD Online Discussion Forums

January 11, 2006, 10:37	beginner level - CG oscillations	#1
Peter Guest Posts: n/a	Hi, I'm working on a CG solver for Navier-Stokes incompressible inviscous equations. Its purpose is purely visual. Advection - pressure cycle with some sources. If anyone has some idea about the following problem I would appreciate it. Jacobi relaxation works fine but CG solver produces strange effect, if speeds in scene exceed 4-6 voxels per frame. Like a frame to frame pulsation, in one frame the speeds are exagerrated, and another almost stopped. Sequence of images, played with every 2nd image, looks roughly continuous. Grid sizes range from 50^3 to 200^3. Basic unprecond. CG solver. Any number of iterations (10-200). Can it somehow converge to the wrong solution?

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