Nested blocks bug? -- CFD Online Discussion Forums

February 23, 2018, 06:05

Nested blocks bug?

Lietuvis

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Join Date: Feb 2018

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Hello. I'm doing ship simulation with 3 nested blocks. Two inside blocks are with grid overlay BC, outside block are with symmetry BC and Specified velocity BC ant at the front and back. With laminar model i get different flow speeds at free surface in the inside block (see attached pictures). With turbulence model (RNG) i get diferent speed at the fluid surface in the biggest block (see attached pictures). i'm fearing that it can distort resistance results. Any ideas how to fix it?

Attached Images

	RNG side.jpg (37.8 KB, 32 views)
	RNG.jpg (62.9 KB, 29 views)
	untitled.jpg (38.9 KB, 31 views)
	1.jpeg (40.5 KB, 27 views)
	2.jpeg (38.8 KB, 27 views)

Tags

block, block interaction, nested blocks, ship simulation

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