# SiteMap Page 182

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# KR43: What is Partial Enclosure Temperature on radiation panel? Do I need to change it?

The Partial Enclosure Temperature is the temperature for radiation purposes of the boundaries not participating in the S2S radiation exchange. You do not need to change it because the default is...

# KR44: Pressure-based solver vs. Density-based solver

Pressure-based algorithm solves the pressure equation to conserve mass and can be used in any flow simulation except with the following features: real gas models, non-reflecting boundary...

# KR45: What is the difference between the density based and pressure based solver?

The pressure-based approach was historically developed for low-speed incompressible flows, while the density-based approach was mainly used for high-speed compressible...

# KR46: How to use gradient option in the DEFINE MODELS Panel?

Gradient options are used to compute the gradient of a scalar at the cell center.<br>The Green-Gauss node-based scheme is more accurate than the Green-Gauss cell-based scheme for...

# KR47: Velocity formulation- absolute vs. relative

Two formulations exist for a rotating reference frame. In the Multiple Reference Frame model, the absolute velocity formulation is preferred in applications where the flow in most of the domain is...

# KR48: Are there any general guidelines on selecting a turbulence model?

Some general guidelines on choosing the turbulence modeling options available in Fluent are as follows:<br><br>Spalart- Allmaras: Economical for large meshes. Performs poorly for 3D...

# KR49: How can both turbulent and laminar flow be included in one model?

You can create separate fluid zones for the laminar and turbulent region. You then have the option of turning off turbulence in the respective fluid zones.

# KR50: How can I save my user-defined material properties or custom materials defined in one FLUENT calculation and re-use them in other calculations?

After specifying your user-defined material properties and/or custom materials within FLUENT, write out a Boundary Conditions file by using the following text interface (TUI)...

# KR51: How do I read in a transient time temperature data to be used as inlet boundary condition?

Create a text file with your data in the following format:<br>sampletabprofile 2 3 0<br>time temperature<br>1 10<br>2 20<br>3 30<br>sampletabprofile is the...

# KR52: How can I copy my case settings from one case to new case?

To save all currently defined boundary conditions to a file, enter the write-bc text command and specify a name for the file.<br><br>file -> write-bc<br><br>FLUENT...

# KR53: How can I impose the solution from the boundary of one case as a boundary condition for another case?

You can use boundary profiles to take the solution from the boundary of one case to serve as a boundary condition for another case. Thus, you can use the flow solution calculated by FLUENT at the...

# KR54: What is the role of under-relaxation parameters? What should be the optimum choice of these parameters?

The default under-relaxation parameters for all variables are set to values that are near optimal, for the largest possible number of cases. These values are suitable for many problems, but for...

# KR55: How to run repetitive tasks in a FLUENT run, e.g. plot contours of pressure every 5 time steps?

There are multiple ways of doing this. One way is to use execute commands:<br><br>Solve->Execute Commands<br><br>It opens the execute commands panel and then you can...

# KR56: When you specify numbers in UDFs, what units need to be used

All numbers specified in UDFs need to be in SI units only

# KR57: I am happy with FLUENT post-processing, what does CFD-Post offer me?

CFD-Post has a modern GUI with a similar structure to that of other ANSYS products. It can also be driven in batch-mode using CCL (CFX Control Language).<br><br>CFD-Post...

# KR58: Does CFD-Post use any extra license?

Yes, it uses the license increment acf_post

# KR59: Is there a 'getting started' guide for CFD-Post for new users showing me workflow and basic steps to do simple post-processing to advanced post-processing?

On the Tutorial page, you will some short instructional videos showing the basics of CFD-Post.<br><br>The CFX tutorials (found under Help->Tutorials) incorporate post-processing...

# KR60: Is there any glossary of different terms CFD-Post uses as compared to FLUENT?

In the ANSYS CFX Reference Guide, under ANSYS Fluent Field Variables Listed by Category, is a side-by-side listing of Fluent and equivalent CFX variables.

# KR61: How can I improve the quality of my animation?

Under the Advanced tab of the Animation Options panel (select the Options button on the Animation panel to display the Animation Options panel), change the Quality under the MPEG Options section...

# KR62: How can I compare with experimental results?

o If the coordinates of the measurement location are known, create a locater point. The predicted value of the measured quantity can be extracted using the ¿probe¿ function in the...

# KR63: VOF: How do I plot the interface between two phases?

In FLUENT, you can contours<br><br>In CFD-POST:<br><br>Assuming that the VOF problem involves water and air, you first create a surface at the interface using...

# KR64: Why should I use Turbo Workspace in CFD-Post to post-process my turbomachinery model?

Turbo Workspace creates additional important variables such as cylindrical velocity components, in both stationary and relative frame and flow angles in both stationary and relative frame. Plots...

# KR65: How do I create multiple blade passages for post-processing if I only analyzed one blade passage?

Click on the ¿Instance Transform¿ button on the top menu bar. Provide the rotational axis, number of passages in 360 deg, and number of copies desired. On the surface to be...

# KR66: How do I determine where a variable min/max are located in my solution?

Create a Point locater (Insert->Location->Point) using the Method ¿Variable Minimum¿ or ¿Variable Maximum¿. A point will be generated at that location. ...

# KR67: In View->Files, one of the files is listed in red. Why?

Note that the entries for probe.x_t are highlighted in red. These entries refer to the file that was originally imported into DesignModeler to create the .agdb file. They are highlighted in red...