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September 18, 2011, 04:30 |
K-ε model in ANSYS
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#1 |
New Member
Join Date: Sep 2011
Posts: 1
Rep Power: 0 |
Hi,
I am trying to build a K-ε model in ANSYS to simulate turbulent air flow over two flat plates. Apparently I don't have a sound understanding of K-ε model, so when it required values of K and ε, I was a bit confused. How could I get these values? |
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September 19, 2011, 03:40 |
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#2 |
Member
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for example :
k= 1.5(U_average*I)^2 ε = C_u^0.75*(K/l)^1.5 |
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September 22, 2011, 21:25 |
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#4 |
New Member
John Moore
Join Date: Oct 2010
Posts: 9
Rep Power: 15 |
Hi,shirley
You can calculate TurbK.E(K) and dissipation (ε) by K = 0.5*(u'^2+v'^2+w'^2) ε = (C_mu^0.75)*(K^1.5)/(Kappa*L) ; C_mu = 0.09 ,generally Kappa = 0.4 L = Lenght {u', v', w'} = turbulence intensity*free stream velocity For example, assume turbulence intensity = 2% free stream velocity = 6m/s Lenght = 5mm u' = v' = w' = 2%*6 = 0.12 K = 0.5*3*0.12 = 0.0216 ε = (0.09^0.75)*(0.0216^1.5)/(0.4*0.005) = 0.26 |
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September 27, 2011, 11:55 |
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#5 |
New Member
Ayothi Ramanathan
Join Date: Sep 2011
Posts: 28
Rep Power: 14 |
Hello shirley,
Based on theoretical aspects, Most of flow analysis will be considering in K-ε model because the flow at inlet of domain is considered as the fully developed flow. This topic related material will be easily available in Ansys help in the topic named as "Basic assumptions". |
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