surface profile
I am studing about self aeration on open channels with Flow-3d softeware.I want to ask a problem about surface profile. I solve one geometry of slope with 15 degree and q=1m^3/s with ks=.001 with step by step method and run it with flow-3d for this problem but I cant match these result. flow-3d gives much bigger rusult. can anybody help me to find why flow-3d cant give the good result about surface profile?
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I tried 3 types for inlet Bc. but didnt catch good result yet:
1.specified pressure with height "11.6" (m) with vent that open "0.35" (m) 2.specified velocity, u=2.64 (m/s) & w= -1.093 (m/s) ,h=11.07 3.volume flow rate, q=1 (m^3/s), x flow direction vector=1 , z flow direction vector= -0.2679 and continuative for outlet BC. The geometry has 40 (m) lenghth and 10.72 (m) height-15 degree- The normal depth is near 0.108 m with formula but with flow3d is near 0.2 m.why? |
Dear navid maroofi.
Try to use outflow BC. BTW 2 and 3 is not quite correct BC. Regards. |
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Will roughness affect?
try to use another mesh. for example number of cells across channel are integer. regards. |
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