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October 3, 2012, 02:47 |
turbulence model for Refrigerator
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#1 |
New Member
Jemyung Cha
Join Date: Jul 2009
Posts: 12
Rep Power: 17 |
Hi, guys.
First please understand my poor English. I am work for home appliance company and studying a domestic refrigerator. My concern is to decide appropriate turbulence model. 1. laminar flow & turbulent flow - In analysis domain of refrigerator, there coexist two flow regimes those are laminar flow and turbulent flow. - laminar flow : local velocity range is about 0.1~1 m/s - turbulent flow : local velocity range near fan is about 10 m/s which is ten to hundreds times higher than laminar flow. 2. turbulence models - I don't need a physical value near fan. - I want to get data near food and food vessels. - I select Realizable k-e(RKE) model because of convergence of fan flow. - divergence with other model (ske, skw, sst) 3. y+ - there are many narrow channel due to food, food vessel and shelves. - So I have to do generate fine mesh. - but y+ is about 3~10. it is in the viscous sublayer. - To avoid y+ problem, I made fine prism mesh near fan and another section. - using enhanced wall function. it converged. - but still divergence with other turbulence models. 4. suggestion - please give me information to select turbulence model and mesh generation. Thanks in advance guys. |
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Tags |
refrigerator, y plus |
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