defining bondaries in multy-blocks

jacky831 · December 18, 2012, 03:21

Hi, there.
The problem i face is how to define bondary type in the connection of two blocks.
The model i created must use sevral blocks to cover,at first i used symmetry bondary to define the connection of two blocks ,but in the analys tab i only can see the part in the first block,the others are missing. then i tried the specified pressure bondary type, it did'nt work either. now i am confused about it. Can you help me?( the model is a spillway.)
thanks!
Best regards!

JBurnham · December 18, 2012, 19:00

You don't need to specify any particular boundary type at the interface of two blocks. The interface has to line up exactly (if the blocks are 'linked'), or the smaller block needs to be inside the larger block entirely. On the Analyze tab, look for the 'Mesh Blocks' button at the bottom and make sure all blocks are activated for display.

jacky831 · December 18, 2012, 21:31

so just specify the ‘linked’ block according to the default Settings ？

zandi · December 22, 2012, 15:25

Quote:

Originally Posted by jacky831

so just specify the ‘linked’ block according to the default Settings ？

I don't know how to make it linked but I specified the joint boundary as 'symmetry' and simulate it. it wroks. I wonder is it correct or not?

Flowdy · November 7, 2013, 16:21

In the code of the case you should put ibct(5)=9, in the right mesh

IBCT(n)

Boundary condition type at mesh block boundaries

1, = symmetry plane
2, = rigid wall
3, = continuative boundary
4, = periodic boundaries (must be applied at opposite sides of mesh)
5, = specified pressure boundary
6, = specified velocity boundary
7, = boundary values obtained from previous calculation using grid overlay (GO) procedure
8, = outflow boundary that minimizes wave reflections
9, = inter-block boundary
10, = surface wave boundary (for n=1, 2, 3 and 4 only)
11, = specified flow rate boundary (Volume flow rate)

December 18, 2012, 03:21	defining bondaries in multy-blocks	#1
jacky831 New Member Join Date: Dec 2012 Posts: 9 Rep Power: 14	Hi, there. The problem i face is how to define bondary type in the connection of two blocks. The model i created must use sevral blocks to cover,at first i used symmetry bondary to define the connection of two blocks ,but in the analys tab i only can see the part in the first block,the others are missing. then i tried the specified pressure bondary type, it did'nt work either. now i am confused about it. Can you help me?( the model is a spillway.) thanks! Best regards!

December 18, 2012, 19:00		#2
JBurnham Senior Member Jeff Burnham Join Date: Apr 2010 Posts: 204 Rep Power: 17	You don't need to specify any particular boundary type at the interface of two blocks. The interface has to line up exactly (if the blocks are 'linked'), or the smaller block needs to be inside the larger block entirely. On the Analyze tab, look for the 'Mesh Blocks' button at the bottom and make sure all blocks are activated for display. zandi likes this.

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December 18, 2012, 21:31		#3
jacky831 New Member Join Date: Dec 2012 Posts: 9 Rep Power: 14	so just specify the ‘linked’ block according to the default Settings ？

November 7, 2013, 16:21		#5
Flowdy New Member Flowdy Join Date: Nov 2013 Posts: 5 Rep Power: 13	In the code of the case you should put ibct(5)=9, in the right mesh IBCT(n) Boundary condition type at mesh block boundaries 1, = symmetry plane 2, = rigid wall 3, = continuative boundary 4, = periodic boundaries (must be applied at opposite sides of mesh) 5, = specified pressure boundary 6, = specified velocity boundary 7, = boundary values obtained from previous calculation using grid overlay (GO) procedure 8, = outflow boundary that minimizes wave reflections 9, = inter-block boundary 10, = surface wave boundary (for n=1, 2, 3 and 4 only) 11, = specified flow rate boundary (Volume flow rate)