Divergence detected in AMG solver: temperature
hello friends,
I am working on 3-D modelling and simulation of strand in the continuous casting process. today i got an error "Divergence detected in AMG solver: x momentum" then i change my modal setting, i make it to transient mode and set adative in time stepping method. now it runs but after some iterations it give another error "Divergence detected in AMG solver: temperature" how to deal with this error?????? please help me... |
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Check your BCs and ensure they are correct! Decrease urf and courant number Change your initialization and check its with another values! Change the solution method If the problem exists yet, check about temporary changing in BCs and iterate some steps and then return them! For example for high temperature flows, it's better to solve its with lower values for temperature then increasing the temp! And for your special case maybe exist some other methods for converging but I don't know about your case! |
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but I all ready done all this which you told above but it shows the same error, the only positive thing is that it calculates some iterations then shows the same error earlier it doesn't calculate the single iterations. |
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If your case have same conditions and you're sure about your grid quality I think temporary changing in BCs will help you! and "solution method" setting could prevent from this error! Ensure that you select good setting for "scheme" & "pressure" & etc! |
finally this way maybe help you:
turn off any setting except turbulence, especially energy equation! then solve the solution and after converging this mode, add other setting to your model little by little and solve the problem for all of them because energy equ. is reason of temperature errors, this way may help you to converging! |
Thank you sir
my simulation run properly without any error but the i am not getting the desired result.
I am using energy,k-episilon standard enhanced wall treatment and the solidification/melting model. my b.c are - solidous and liquidous temp are 821 inlet temp. at velocity inlet is 851 and +ve velocity outlet is also taken as velocity inlet with temp.- 300 and -ve velocity I got the temp. profile but not getting any solidification there. any idea about this???????????????? |
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