Problem with hybrid initialisation

tes · November 7, 2022, 19:06

Hi! I need help to solve the problem when calculating the cooling of the flame tube.

I see this warning:
Checking case topology...
-this case has inlets & outlets both
-pressure information is not available at the boundaries,
so it will be initialized with constant pressure

Here's the detail i put while solving this question:

SOLVER TYPE : Pressure Based
Velocity Formulation : Absolute
Time : Steady

MODEL : k-w SST

BOUNDARY CONDITION :
1.
Inlet1: mass-flow-inlet (m = 0.001875, initial gauge pressure = 82500 Pa, T = 750 K);
Inlet2: mass-flow-inlet (m = 0.0075, initial gauge pressure = 80500 Pa, T = 1750 K).

2.
Outlet1: pressure-outlet ( Gauge pressure = 80000 Pa, T = 750)
Outlet2: pressure-outlet ( Gauge pressure = 80000 Pa, T = 1750)

Thank you!

fredo490 · November 8, 2022, 21:20

Hybrid initialization is not a requirement and in many cases the standard initialization is recommended (see the manual for more details).
Hybrid initialization simply computes a quick Eulerian solution to try to give a more realistic flow pattern than a simple homogeneous initialization. It is only here to help convergence, it does not affect the final solution.

Simply ignore this message or switch to a standard initialization.

November 7, 2022, 19:06	Problem with hybrid initialisation	#1
tes New Member Ekaterina Join Date: Nov 2022 Posts: 1 Rep Power: 0	Hi! I need help to solve the problem when calculating the cooling of the flame tube. I see this warning: Checking case topology... -this case has inlets & outlets both -pressure information is not available at the boundaries, so it will be initialized with constant pressure Here's the detail i put while solving this question: SOLVER TYPE : Pressure Based Velocity Formulation : Absolute Time : Steady MODEL : k-w SST BOUNDARY CONDITION : 1. Inlet1: mass-flow-inlet (m = 0.001875, initial gauge pressure = 82500 Pa, T = 750 K); Inlet2: mass-flow-inlet (m = 0.0075, initial gauge pressure = 80500 Pa, T = 1750 K). 2. Outlet1: pressure-outlet ( Gauge pressure = 80000 Pa, T = 750) Outlet2: pressure-outlet ( Gauge pressure = 80000 Pa, T = 1750) Thank you!

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November 8, 2022, 21:20		#2
fredo490 Senior Member HECKMANN Frédéric Join Date: Jul 2010 Posts: 249 Rep Power: 16	Hybrid initialization is not a requirement and in many cases the standard initialization is recommended (see the manual for more details). Hybrid initialization simply computes a quick Eulerian solution to try to give a more realistic flow pattern than a simple homogeneous initialization. It is only here to help convergence, it does not affect the final solution. Simply ignore this message or switch to a standard initialization.