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September 16, 2008, 02:48 |
S2S model
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#1 |
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hello sir,
i have some problems about radiation modelling in S2S: here is some description of problem :: square 2D cavity bottom hot top cold side walls adiabatic i am using S2s model but i see that it is not giving correct results for the low emissivities e.g.top bottom 0.5 and side walls 0.1 Radiation Heat Transfer Rate (w) -------------------------------- -------------------- bottom 0.22598088 left 0.00022241924 right 0.00030250785 top 0.12082574 ---------------- -------------------- Net 0.34733155 but it gives accurate results if i keep e=1 for all (for checking this i have kept gravity=0 and k =0 for air so that i get only radiative heat transfer) one more absurd thing is that if i keep one of the top or bottom e=0 it gives like : Radiation Heat Transfer Rate (w) -------------------------------- -------------------- bottom 0 left 0.00020713897 right 0.00024958443 top 0.017235142 ---------------- -------------------- Net 0.017691865 which actually should be close to 0. this is what i find problematic maximum iterations exceeded in radiation calculations. Radiosity unconverged after 5 iterations Final radiosity residual = 2.983e-003 can you please guide me regarding this ? (emissivity i give in the internal emissivity) waiting for reply mandar |
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