CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

high resolution scheme

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

LinkBack Thread Tools Search this Thread Display Modes
Old   August 6, 2008, 02:13
Default high resolution scheme
Posts: n/a
what is meant by high resolution scheme in cfx
  Reply With Quote

Old   August 6, 2008, 03:09
Default Re: high resolution scheme
Posts: n/a
Mainly 2 types of schemes 1)UPWIND 2)High resolution your given upwind thenumber of iteration will take slowly one by one in case High resolution:very fast iterations will take time consuming.
  Reply With Quote

Old   August 6, 2008, 03:09
Default Re: high resolution scheme
Posts: n/a

You will find an explanation in section 4.2.2 of this article: Numerical and Experimental Studies of the Flow Field in a Cyclone Dryer


  Reply With Quote

Old   August 6, 2008, 07:03
Default Re: high resolution scheme
Rogerio Fernandes Brito
Posts: n/a
Step 6: Solver Control Setting We are almost done. The next icon of interest, , opens up the Solver Control window. Unlike other programs that have a ton of possible settings for solver controls, CFX is quite simple. The solver itself is quite robust so you don't have to worry about the multitude of options presented in other codes. Click on the Solver Control icon to open up the window shown below in Fig. 5. Let's begin with the Advection Scheme.

It has three possible settings: High Resolution, Upwind and Specified Blend Factor. The upwind scheme is a simple and robust convective scheme but can be very diffusive. It can be used to start up difficult problems but in general should be avoided. The Specified Blend Factor allows the user to enter a value between 0 (upwind) and 1 (2nd Order), this will fix the order of the scheme. The High Resolution option will attempt to set the order of the scheme as high as possible automatically while keeping the solution bounded everywhere. The High Resolution scheme is what I would recommend for users. I will go into more details about the advection schemes in future articles but for the most part, stick to the High Resolution scheme. Under Convergence Control, use the Auto Timescale for Timescale Control and also leave the value of 100 for Max Iterations. Keep the Length Scale Option set to Conservative. Change the Residual Type from RMS to MAX and leave the Residual Target at 1.E-04. A residual value of 1.E-04 for the RMS setting is good for obtaining a faster solution and to get an idea of how the flow is developing.

Setting the value of 1.E-04 for the MAX value gives a tighter convergence and is pretty good for extracting quantitative results results for most problems. Click Ok to accept the settings. The next icon, , is useful for saving information during the solution of a model. You can save as much or as little information as you want and you also have several options to control when you save the information. We will skip this icon for this example.

Source: December 15, 2006 - The Focus - Issue 54
  Reply With Quote

Old   April 20, 2014, 12:59
Default Query regarding CFX-SOlver
New Member
Join Date: Jan 2014
Posts: 14
Rep Power: 12
manpreet is on a distinguished road
Hello Everyone,
I am Manpreet. I need help fpr my project that is Fluid flow analysis through passage of NASA Rotor 37. I am working with CFX. I am not familiar with certain terms such as Advection scheme, Turbulence numeric , RMS and Timescale control. What are physical significance of all these terms and their effect on solution. In my case, using:
Advection scheme: High resolution
Turbulence numeric: First order
RMS: 1E-4
Time scale : 1E-5. But I do not know why these specific values?
In addition , What does it mean by solution being bounded and overshoot , undershoot?
Please help me . I need to submit my results by next week.
I really appreciate.
manpreet is offline   Reply With Quote

Old   April 20, 2014, 23:37
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,749
Rep Power: 143
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
These are very basic CFD concepts. Any introductory CFD text will explain them to you - so time to visit the library.

And before you ask, no I will not type definitions of all that stuff in the forum. It is easily found in any CFD textbook.
ghorrocks is offline   Reply With Quote


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
how to understand high resolution scheme and high order scheme iilw1314 Main CFD Forum 7 April 12, 2022 12:29
[CFD-Post] High resolution scheme blend factor siw CFX 5 May 26, 2011 17:23
high resolution scheme az_f CFX 0 November 24, 2010 22:52
High resolution scheme??? vijay CFX 1 April 22, 2008 09:37
Multicomponent fluid Andrea CFX 2 October 11, 2004 05:12

All times are GMT -4. The time now is 23:42.