# computing streamlines

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

 July 26, 2001, 22:24 computing streamlines #1 yfyap Guest   Posts: n/a by using primitive variable formulation, solution for a duct flow problem is computed. in order to depict the secondary flow that arises due to the difference in temperature, it is of interest to compute the streamlines in the x-y plane (z-streamwise direction). the problem is how should the streamfunction be defined for such situation since du/dx + dv/dy + dw/dz = 0 which implies du/dx + dv/dy <>0 ? any advice is greatly appreciated. thanks.

 July 28, 2001, 15:15 Re: computing streamlines #2 John C. Chien Guest   Posts: n/a (1). Stream function is good for 2-D problem only. (2). For 3-D streamline, you can trace the fluid particle path. This is commonly done, and by changling the viewing angle, you can check the 3-D behavior of the flow field. (3). The secondary flow term is not very scientific, you will have to define it clearly first. (4). The existence of the secondary flow comes from the behavior of the primary flow direction. So, you need to define the primary flow direction first. (which can be another problem for 3-D flow) (5). Make sure that you know what you are looking for.(and also the definition of the secondary flow. It has been a problem for many engineers.)

 July 31, 2001, 22:45 Re: computing streamlines #3 yfyap Guest   Posts: n/a thanks. can you suggest any reference on tracing the fluid particle path? thanks, again for you willingness to spend time on this. regards, yfyap

 July 31, 2001, 23:07 Re: computing streamlines #4 John C. Chien Guest   Posts: n/a (1). pick a starting point, with u,v,w known. (2). determine the next point position based on the given delta(s), the distance traveled along the fluid particle path. (3). with the new position known, calculate the new velocity u,v,w based on neighboring points velocity field. (4). repeat the step-2 to determine the third point location, and so forth. (5). Most graphic post-processing tool should have this capability included.

 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 Beatríz Navarro CFX 4 June 27, 2006 04:39 Beatríz Navarro Main CFD Forum 1 June 25, 2006 14:25 Beatríz Navarro NUMECA 0 June 24, 2006 18:23 Beatríz Navarro FLUENT 0 June 24, 2006 18:22 Mohamed GUEROUACHE Main CFD Forum 1 September 13, 1999 13:33

All times are GMT -4. The time now is 12:49.