negative flux

antonio · March 6, 2012, 10:53

I am trying to simulate the deposition of sediments in a channel using the algebraic slip model in cfx (transient simulation). In this context, I need to compute the flux of sediments in several cross sections. For this purpose, I am using, for several planes, expressions similar to massFlowInt(sediments.Mass Fraction)@Plane 2. My question is related to the fact that I have for certain timesteps negative fluxes. The direction of the flow in my example is contrary to the global coordinate system of cfx but for most timesteps of my calculation these fluxes are positive (when I use the above expression). So, my question is:what´s the meaning of these negative fluxes?Is this a bug?
Regards

ghorrocks · March 6, 2012, 16:09

I cannot answer your question, but I will point out that CFX does not have sediment deposition models in it so I cannot see how you are going to model what you are trying to model with CFX.

March 6, 2012, 10:53	negative flux	#1
antonio Senior Member Join Date: Jan 2010 Posts: 110 Rep Power: 16	I am trying to simulate the deposition of sediments in a channel using the algebraic slip model in cfx (transient simulation). In this context, I need to compute the flux of sediments in several cross sections. For this purpose, I am using, for several planes, expressions similar to massFlowInt(sediments.Mass Fraction)@Plane 2. My question is related to the fact that I have for certain timesteps negative fluxes. The direction of the flow in my example is contrary to the global coordinate system of cfx but for most timesteps of my calculation these fluxes are positive (when I use the above expression). So, my question is:what´s the meaning of these negative fluxes?Is this a bug? Regards

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March 6, 2012, 16:09		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	I cannot answer your question, but I will point out that CFX does not have sediment deposition models in it so I cannot see how you are going to model what you are trying to model with CFX.