Solution Initialization for RDE

Shree_aero · May 5, 2018, 15:30

Hi all, I am having trouble in initializing my 2-D Rotational Detonation Engine model, and was wondering if anybody can assist me with it. Currently, I am facing with the problem as to how to initialize the model in Solution Initialization in FLUENT, where we select the zones to begin computing from and then patch in values. I am unable to figure out from which zone should I compute solution from? If I select "all zones" from the drop down menu of "Compute from" I get a high value of Gauge Pressure and other input values which the software calculates based on the inlet and outlet boundary condition values provided initially.Is it possible to initialize with selecting any zone from "Compute from" options. How will that affect my boundary conditions? Thank you.

LuckyTran · May 5, 2018, 17:43

BC's are BC's, the initialization doesn't do anything to BC's.

The compute from feature is just a convenience feature for lazy people. When you choose compute from, the numbers that actually get initialized appear in the boxes below. If you don't like the numbers, replace them.

And isn't an RDE a transient problem? Then your initialization is super important because it's your initial condition.

May 5, 2018, 15:30	Solution Initialization for RDE	#1
Shree_aero New Member Join Date: May 2018 Posts: 1 Rep Power: 0	Hi all, I am having trouble in initializing my 2-D Rotational Detonation Engine model, and was wondering if anybody can assist me with it. Currently, I am facing with the problem as to how to initialize the model in Solution Initialization in FLUENT, where we select the zones to begin computing from and then patch in values. I am unable to figure out from which zone should I compute solution from? If I select "all zones" from the drop down menu of "Compute from" I get a high value of Gauge Pressure and other input values which the software calculates based on the inlet and outlet boundary condition values provided initially.Is it possible to initialize with selecting any zone from "Compute from" options. How will that affect my boundary conditions? Thank you.

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May 5, 2018, 17:43		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,761 Rep Power: 66	BC's are BC's, the initialization doesn't do anything to BC's. The compute from feature is just a convenience feature for lazy people. When you choose compute from, the numbers that actually get initialized appear in the boxes below. If you don't like the numbers, replace them. And isn't an RDE a transient problem? Then your initialization is super important because it's your initial condition.