Temperatures not converging

Dharma Vedula · April 18, 2019, 02:59

Velocities and pressure results of my Python code for SIMPLER algorithm for laminar flow through a 3-D duct are converging and giving correct values. The temperature results from energy equation solution are not converging and not giving correct values. Constant wall temperature boundary condition. Any tips, please.

LuckyTran · April 19, 2019, 15:19

Maybe there is a bug in your code. Or perhaps there is an elephant.

Either, you describe what your code does in pseudo-code or just dump it here and pray that someone reads it. SIMPLEX is a method to solve the continuity & momentum equation, it says almost nothing about how you solve the coupled system of equations involving the energy equation.

Dharma Vedula · April 20, 2019, 06:41

Thank you for your reply and concern shown.
I uploaded a pdf-file showing the pressure and u-velocity grids. I will be thankful if you can answer my question.
With warm regardss,
Dharma Rao Vedula

LuckyTran · April 20, 2019, 11:47

All you did was draw a grid which isn't even a grid. It's a line with dots and bars on it and no indication of whether you are doing FD, FEM, or FVM. The reason your temperature cannot converge is because you have no code!

April 18, 2019, 02:59	Temperatures not converging	#1
Dharma Vedula New Member Dharma Join Date: Jun 2017 Posts: 13 Rep Power: 9	Velocities and pressure results of my Python code for SIMPLER algorithm for laminar flow through a 3-D duct are converging and giving correct values. The temperature results from energy equation solution are not converging and not giving correct values. Constant wall temperature boundary condition. Any tips, please.

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April 19, 2019, 15:19		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,750 Rep Power: 66	Maybe there is a bug in your code. Or perhaps there is an elephant. Either, you describe what your code does in pseudo-code or just dump it here and pray that someone reads it. SIMPLEX is a method to solve the continuity & momentum equation, it says almost nothing about how you solve the coupled system of equations involving the energy equation.

April 20, 2019, 11:47		#4
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,750 Rep Power: 66	All you did was draw a grid which isn't even a grid. It's a line with dots and bars on it and no indication of whether you are doing FD, FEM, or FVM. The reason your temperature cannot converge is because you have no code!