May 14, 2021 at 4:25 pmatulsingh92Subscriber
So, I wanted to know if there would be any general reasons to fix if my 1st 10-15 iterations take a lot of time to come, and then my simulation diverges at 100-200 iterations later. The ones from lets say 30 to 100 are quick enough on a 6 core pc with 300k cells (small size), although it diverges anyways.
The question is why would iterations 1 to 10 take so much time, compared to others, where ideally, the solver runs quickly.
I have mass-flow-inlet at the blue region, attached to the 4 tubes and a symmetric design at the other end.May 17, 2021 at 8:58 amDrAmineAnsys EmployeeFirst of all check if the mesh of proper quality in Fluent: Orthogonal quality, Skewness as well as aspect ratio
May 18, 2021 at 12:13 pmatulsingh92SubscriberMin orthognal quality comes at around 0.2
And I think it should be less than 0.1
But as I am using the "outline tab" for meshing in fluent meshing using batch submission with the help of TUI commands (2019R2), I am unsure of how can I get this under 0.1 ?
May 18, 2021 at 12:20 pmDrAmineAnsys EmployeeOrth quality should be as large as possible: values near 1 are ideal (1 will imply pure hex). So no need to try to reduce it...
May 18, 2021 at 12:48 pmRobAnsys EmployeeDid you define "zero temperature" or leave it as the default condition? What is the inlet velocity?
May 18, 2021 at 2:14 pmatulsingh92SubscriberYes, the rectangular region is a wall with zero temperature, while the tubes are at 300k, with fluid at 373K. The blue area is mass flow inlet at 0.0014 kg/s. The whole domain should have the bounding box of (700 X 100 X 40 )mm.
May 18, 2021 at 3:32 pmRobAnsys EmployeeYou set zero temperature? Which units are you using?
May 18, 2021 at 6:04 pmViewing 7 reply threads
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