Finding node numbers in GAMBIT for FIDAP simulations |
In my FIDAP model I make reference to particular nodes in the mesh. The actual number comes from the neutral file via GAMBIT. When I increase/decrease the mesh density or change the location of... |
New argument added in the turbulent conductivity macro C_K_T for 6.1 |
Fluent6.0 turbulent conductivity macro used 2 arguments : C_K_T(c,t)<br>Fluent6.1 turbulent condcutivity macro uses 3 arguments : C_K_T(c,t,prt)<br><br>How to define this new... |
How to ensure that a particular interoir face zone lies within one partition? |
Sometimes we need to ensure that a particular interior face zone lies within<br>a single partition in a parallel simulation. (Fluent6.1.22 has a bug that we cannot<br>convert an... |
How to calculate the correct net mass flux for a cell? |
User wants to compute net flux through all faces in a given cell. I created a 2d test case where all interior face velocities are set to 1 by patching. The printout from udf shows that two cells... |
Graceful exit from a batch run with an error |
On running in batch mode, any error generated when reading the journal file (e.g., wrong case/data name, no license available, divergence, etc.) causes the batch file to just stop dead. This is... |
How to copy multiple injections |
FLUENT6 users may want to copy the DPM injections defined at one surface to another. The GUI allows for injections to be copied one at a time.<br>Obviously, this can be very tedious when you... |
average path length from each injection |
The following udf can be used to calculate average path length and residence time<br>from each injection and can also be used to find out the average path length<br>of all... |
How to set user defined porous coefficients? |
User is working on user defined porous media coefficients. Based on our documentation,<br><a target=_blank... |
increasing the face area by a factor. |
Heat exchangers may have fairly complicated fins<br>associate with it. Clients prefer to model such heat exchanger by assuming it<br>as a straight tube bundle but with increase... |
How to debug the error when launching Fluent-Wave cosimulation |
During the setup of a Fluent-Wave cosimualtion, the coupling module will be called and the wave will be launched in the background when you click the start button in Define -> 1D coupling... |
Fluent 6.1.22: Make sure to check this when getting a parse error interpreting a UDF on Windows |
A problem was encountered when interpreting a UDF on Windows. The command terminated with parse error.<br>The situation occured since there were blank spaces in the name of the directory... |
Calling FORTRAN subroutines in FLUENT V6.1 User Defined Functions (UDFs) for linux platforms. |
This solution describes, by example, the procedures that need to be followed to call a fortran subroutine from a udf written in C for FLUENT V6.1. This procedure has been tested on lnx86 and some... |
Rename the walls created by grid interfaces while running journal files- FLUENT-6.1.22 |
When a grid-interface is created, FLUENT creates two new wall zones/surfaces. These are named like wall-<zone id>. If there are many wall zones already existing in the case,... |
POLYFLOW - Create a UDF of evolution parameter (S) or time |
How to create a UDF for describing a boundary condition dependent on the evolution parameter (S) or time ?<br>In the appropriate menu, click on EVOL:<br>select the item User Defined... |
To display unsolved UDS on wall or symmetry |
A client is solving for voltage and power dissipation in a glass furnace. He wants to display the power dissipation on a wall. He is solving for one<br>UDS (voltage) and then storing the... |
Improve DO radiation modeling results for high optical thickness |
Typically, for glass melting furnace simulation, DO radiation modeling is recommended if the user wants to include the effect of semi-transparent<br>radiation and non-gray radiation. The... |
conservation of total_enthalpy and total_energy |
Following conclusions based on thermodynamic definitions could be useful when checking for conservation of total_energy or total_enthalpy in a... |
Modifying the Rosin Rammler spread parameter for the atomizer models |
In Fluent 6.1, by default, the spread parameter for Rosin Rammler distribution is 4.0 for effervescent atomizer, and 3.5 for the other atomizers. Is it possible to change this... |
Convergence of User Defined Scalar |
There might be a need to solve for User Defined Scalar(UDS) in Fluent6.1.22. It has been found that in some instances, using zero diffusivity for UDS leads to NAN. Also, first-order discretisation... |
Adding a new object (impeller) to an existing model |
After having created a model, I would like to modify the "User Object Directory" setting in order to add a new object using a brand new object definition (.mxo) file.<br>But... |
How to create an iso-surface along an arbitrarily oriented plane? |
<br>Sometimes one needs to create an iso-surface that is arbitrarily oriented in space,<br>i.e. not parallel or perpendicular to any coordinate axis. This is accomplished as... |
computing the percentage of area of a surface above or below some specified value |
client is interested to calculate the percent area of a surface (usually a flat cross-section of a model) that has a value at or above (or at or below) a given value. For example, to look at... |
Check for inlet temperature |
Following procedure could be used to compute specified input temperature at an inlet from simulation results. The procedure could be used after proper convergence is achieved in a case which has... |
Mass Flow Rate on an interface |
Following UDF could be used to display mass flow rate on an interface. User defined memory is used to store face fluxes on the interface.<br>/*UDF to display mass flow rate on an... |
How to calculate/report torque acting on a rotor's shaft? |
Torque acting on a shaft is always an important quantity user often wants to caculate and monitor from a simulation. Fluent postprocessing REPORT panel allows users to report moment of the face... |