CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Boundary conditions for supersonic flow over a cavity.

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 5, 2020, 12:07
Default Boundary conditions for supersonic flow over a cavity.
  #1
New Member
 
Harjit
Join Date: Feb 2020
Posts: 7
Rep Power: 4
harji95 is on a distinguished road
Hello everyone,


I'm modelling a 2D problem involving flow @ M=1.5 over a cavity. First, I'm trying to model the cavity with the same BCs as one reference paper.



So the free stream conditions are P_inf=66.4 kPa, T_inf=218 K and M_inf=1.5 and the boundary conditions are as following (check the figures):


Inlet (A) : the solution of the two-dimensional steady-state Navier-Stokes equations over a flat plate is used as inflow boundary condition to make sure the flow is fully developed at the entrance of the cavity.


Upper wall (H) and Outlet (G) are imposed as pressure-far-field with the free stream conditions.


All the others (B, C, D, E, F) as wall with no slip conditions.



and for the flat plate as follow:


A, D, C as pressure-far-field with free stream conditions; B as wall.


The stready is done and I have similar thickness for the boundary layer. For the transient I did /file/interpolate/read-data and read data from the steady case. The meshs are exactly the same. The density of air is set to ideal-gas.


However, my results for the transient study on the cavity do not make any sense. I have tried also putting the inlet as pressure-far-field but nothing changed. I have attached all the pictures.


Could anyone tell me if I'm doing something wrong?


Thanks in advance.
Attached Images
File Type: jpg bcs.jpg (32.3 KB, 4 views)
File Type: jpg bcs_p.jpg (28.4 KB, 4 views)
File Type: jpg bl_v.jpg (45.6 KB, 3 views)
File Type: jpg open_p.jpg (36.8 KB, 5 views)
File Type: jpg open_v.jpg (36.8 KB, 3 views)
harji95 is offline   Reply With Quote

Reply

Tags
boundaries condition, cavity flow, supersonic flow

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Velocity vector in impeller passage ngoc_tran_bao CFX 24 May 3, 2016 22:16
Wrong flow in ratating domain problem Sanyo CFX 17 August 15, 2015 07:20
Boundary conditions for flow in nozzle kgevers FLUENT 0 July 26, 2015 13:46
Overflow Error in Multiphase Modelling with Two Continuous Fluids ashtonJ CFX 6 August 11, 2014 15:32
An error has occurred in cfx5solve: volo87 CFX 5 June 14, 2013 18:44


All times are GMT -4. The time now is 16:22.