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October 21, 2016, 06:35 |
gap between rotor and stator domains
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#1 |
Member
Alex
Join Date: Feb 2016
Posts: 81
Rep Power: 10 |
Hi to all!
Trying to simulate axial compressor, I get little gap between domains. I have to create one part between rotor and stator using meshing while rotor and stator domains meshes are done via turbogrid. But inlet/outlet borders in TG have little differences from desired. Changing A and R coordinates I cannot assign accurate values. Ex.: R2 Inlet: (1725;170.850679) for hub changes into (1725;170.839) automatically. This border is not vertical if it does matter. So, I get few microns wide gap, although results in CFX-Post seem to be acceptable as if there's not any gap. Is there any tolerance values for such gaps? Or is it not a problem at all? |
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October 21, 2016, 06:37 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
GGI interfaces can handle small gaps. Have a look at the overlap % to see if you have any unexpected regions which have not matched up.
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October 24, 2016, 02:21 |
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#3 | |
Member
Alex
Join Date: Feb 2016
Posts: 81
Rep Power: 10 |
Quote:
1. how can I determine whether this gap is small enough to be handled or not? 2. and how can I see this overlapping? Do you mean solver .out file? I've found overlap and non-overlap mentioning but what do these numbers mean? Is there somrthing bad? "Domain Interface Name : S1 cav1 Discretization type = GGI Intersection type = Direct Non-overlap area fraction on side 1 = 4.05E-01 Non-overlap area fraction on side 2 = 7.07E-02" " Interpolating Onto Domain "cav1" Searching for Candidate Source Domains: Domain "S1" Number of Mapped Nodes = 24911 ( 8.8%) Bounding Box Overlap Volume = 2.35554E-04 ( 29.0%) Setting Up Unmapped Nodes: Number of Unmapped Nodes = 257581 ( 91.2%)" |
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