September 3, 2019 at 11:30 amhugo CFDSubscriber
I simulated a flow of air going through a plate heat exchanger. The duct has fins of triangular section. The simulation is performed for steady state.
The mesh data is:
Skewness: 0.79 Aspect ratio: 3.19 Orthogonal quality: 0.43
The convergence residues obtained were:
What is the reason associated with the irregularity of the lines? Although the mesh is of good quality, can the poorer elements still cause this effect? May I consider that there is convergence of the solution?
September 3, 2019 at 12:50 pmRobAnsys Employee
Have a look at the flow field and plot images every few iterations to compare: I suspect the flow is marginally transient.
September 3, 2019 at 1:23 pmhugo CFDSubscriber
What do you mean by flow field?
September 3, 2019 at 2:27 pmRobAnsys Employee
Velocity, pressure etc. You're usually looking for flow separation or regions where the Coanda effect may occur.
September 3, 2019 at 3:12 pmhugo CFDSubscriber
The charts of velocity and pressure in direction of the flow.
Variations in velocity and pressure are a consequence of the flow through the fins.
However I did the same analysis for the following fins.
All dimensions and analysis conditions are the same as the previous example. However the residues obtained are quite different.
Why is there such a difference?
September 3, 2019 at 4:39 pmDrAmineAnsys Employee
Increase resolution of the triangular fines and pseudo transient coupled solver. Mesh not ideal.
September 3, 2019 at 8:30 pmhugo CFDSubscriber
yes. The pseudo transient and coupled solver was thar i used.
Why mesh is not ideal?
September 4, 2019 at 5:03 amDrAmineAnsys EmployeeCurvature and angle are not well resolved along the obstacles
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