Temperature Limited Problem

tuna · March 11, 2016, 07:28

Hi everyone,

I have a problem about "Temperature Limited Problem". BC's of geometry are inlet=308 K and surface temperature of wall is 293 K. But some point temperature is nearly 2437K to 5000K. How can I solve this Problem ? Anyone can help me ? I tried lots of methods. For example I increased mesh elements. 2000000 is enough but increased 4000000 mesh elements and I changed convergence criteria and changed solution methods but I can not find anything. Outlet BC is pressure outlet and default of program of specification method under Momentum title gives intensity and viscosity but my solution model is k-e therefore I changed intensity/viscosity to k-e but this method did not help me. Anyone can help me ? (Note: inlet and outlet hydraulic diameter of my geometry is not same.)

Thanks for helps.
Best wishes

`e` · March 11, 2016, 16:06

What is the geometry and where is this peak temperature found? Perhaps include a temperature contour plot.

What are the initial conditions and is the flow steady or transient?

tuna · March 12, 2016, 07:53

The initial condition is V=2.74 m/s and Temperature is 308 K and flow is steady ?

Quote:

Originally Posted by `e`

What is the geometry and where is this peak temperature found? Perhaps include a temperature contour plot.

What are the initial conditions and is the flow steady or transient?

March 11, 2016, 07:28	Temperature Limited Problem	#1
tuna New Member tuna Join Date: Sep 2015 Posts: 11 Rep Power: 10	Hi everyone, I have a problem about "Temperature Limited Problem". BC's of geometry are inlet=308 K and surface temperature of wall is 293 K. But some point temperature is nearly 2437K to 5000K. How can I solve this Problem ? Anyone can help me ? I tried lots of methods. For example I increased mesh elements. 2000000 is enough but increased 4000000 mesh elements and I changed convergence criteria and changed solution methods but I can not find anything. Outlet BC is pressure outlet and default of program of specification method under Momentum title gives intensity and viscosity but my solution model is k-e therefore I changed intensity/viscosity to k-e but this method did not help me. Anyone can help me ? (Note: inlet and outlet hydraulic diameter of my geometry is not same.) Thanks for helps. Best wishes

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March 11, 2016, 16:06		#2
`e` Senior Member Join Date: Mar 2015 Posts: 892 Rep Power: 18	What is the geometry and where is this peak temperature found? Perhaps include a temperature contour plot. What are the initial conditions and is the flow steady or transient?