|July 19, 2012, 00:44||
Join Date: Jan 2011
Posts: 32Rep Power: 7
Hi CFX Users,
I am simulating a case into a small rectangular box(length=width=1m, height=0.3m) open top, wall non-slip rigid insulated and bottom also insulated except the small nozle(r=0.005m) for injecting single phase water jet flow inside it. Newtonian stratified single phase fluid is considered in this box. From calculation, I put water jet velocity0.0343m/s and its temperature 298.64K. As stratified fluid stay in the box so every meter of height of the box temperature will chage N=8.155 K/m so i write an expression To=302.44-N* Z coordinate, and initializes it . Choose bouyancy and its temperature 300K from setup as this is a negative bouyancy case.
mesh sizes 3mm, time step 0.087 with 1.8million of mesh, I run this simulation for 400sec.
Everything fine , simulation finished well but the problem is jet flow penetration height inside this box is not long enough what we expected from previous investigations done by another people in fluent.
I do not understand what is happening. I tried in different way but no solutions i get till now.
If anybody give me any suggestion it will be a great help for me.Because around me knowbody actually know CFX.
|July 19, 2012, 06:08||
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 12,412Rep Power: 97
Can you confirm that your temperature function just defines the intial condition? Obvious from there the air establishes its own temperature field in the simulation.
Have a look at this FAQ: http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F
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