# a special boundary condition problem!!

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

 October 14, 2005, 07:23 a special boundary condition problem!! #1 hillriver Guest   Posts: n/a i simulate a water radiator .i must assign the velocity and pressure at inlet .but fluent can only use one boundary condition on one face.i don't know how to do it!is there anyone can help me?thanks a lot!

 October 16, 2005, 01:57 Re: a special boundary condition problem!! #2 Sachin Kulkarni Guest   Posts: n/a Hello, Yes, the inlet zone can either be of type "pressure-inlet" OR "velocity-inlet" - not both at the same time. This is because, the pressure and velocity are tightly coupled to each other and fixing the value of one inevitably fixes the value of the other variable. You can't apply both the values (of your choice) at the same time. Thus, if you apply a particular value of velocity at the inlet, then, you need a particular pressure to maintain that velocity at inlet (because of the frictional and other losses in the pipe). This pressure value will be a part of the solution. On the other hand, if you decide to supply water at a fixed pressure at the inlet, the flow rate will be governed by this value of pressure and it will come as a part of the solution.

 October 17, 2005, 09:07 Re: a special boundary condition problem!! #3 Brian Tang Guest   Posts: n/a I believe you might be able to use a mass-flow inlet boundary condition - assuming you know the density of the fluid, you can calculate the appropriate massflow that will give your required velocity condition. With a mass-flow inlet, you specify the static pressure and temperature as well as the massflow. Hope that helps, Brian

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post murali CFX 5 August 3, 2012 08:56 Shafiul CFX 7 January 11, 2011 17:40 winnawinna FLUENT 0 December 29, 2010 00:32 Pankaj CFX 9 November 23, 2009 05:05 Lio FLUENT 4 July 6, 2004 08:23

All times are GMT -4. The time now is 02:52.