How to reset flowtime for unsteady calculation ? |
A user is doing unsteady calculation and at one point in the simulation time, user would like to<br>reset the current flow time to 0 or to any specified user value. How to do this... |
Fluent6: Patch: Doesn't treat previous time step data fields! Tracer transport calculation irreproducible! |
I'm doing unsteady tracer transport in a frozen flow field.<br>I patch the initial conditions and run the calculation. Sensible results.<br>I re-patch the same initial... |
Access surface averages from a UDF |
A user wants to access surface average values in a UDF.<br>This is difficult, but not impossible.<br>The surface averages will have to be calculated on the cortex side of... |
FLUENT 6 - DEFINE_VECTOR_EXCHANGE_PROPERTY example |
The use of DEFINE_VECTOR_EXCHANGE_PROPERTY is difficult, because the velocities that are needed for the calculation of the drag coefficient are not in the data fields they are supposed to be. At... |
Handling of the sliding mesh interface for moving/deforming meshes involving launch problems |
A sliding mesh interface is often needed for moving/deforming mesh cases. A class of problems for which this maybe necessary is the a launch<br>tube problem. In this cases you have a... |
Cell Wall Distance in UDF: C_WALL_DIST, Fill_Cell_Wall_Distance, don't always work. |
The cell wall distance is needed in a UDF for a laminar case.<br>Here, the default tools in FLUENT's UDF interface (like C_WALL_DIST(c,t)) don't work, because FLUENT... |
Calculate massflow rate and maximum temperature at an interior face |
For post-processing purposes, it is often needed to determine the mass flow rate at an interior zone (that already has an ID). This information can be used to calculate mass flow average... |
Changing the mixture fraction variance lower and upper limits in prepdf |
When using prepdf, the intervals of mixture fraction variance is always fixed from 0 to 2.5E-1. Is it possible to change it ?<br>Prepdf displays the SCALED mixture fraction variance defined... |
get "nan" on energy is iterated from converged cold-flow |
The basic procedure for underhood case is:<br><br>1. activate SKE, DO, and Energy models<br>2. setup boundary conditions for flow, temperature, and radiation in serial solver... |
Exceed.exe has generated errors and will write a log file |
When trying to open up GAMBIT or FIDAP this error message appears and GAMBIT or FIDAP will not start up. The problem is with the Spaceball 4000 driver as Hummingbird Exceed (any versions less than... |
Fluent6: UDF: How to access mole fraction of species |
To access the mass fraction of a species, the macro C_YI(c,t,i) can be used. How could the mole fraction be accessed?<br>The mole fraction of a species in a mixture can be calculated... |
Workaround for interpreted UDF problem in Linux parallel |
The following error message is sometimes encountered when loading a case with an interpreted UDF into parallel with Fluent 6 on a single, multiprocessor Linux box:<br><br>input in flex... |
Force monitors to write to current working directory |
Currently, Fluent sets the surface- and volume-monitor save path to be that of the working directory at the time the monitor is defined. Later simulations in other directories may fail because of... |
FLUENT 6 - One of the common reasons for 'Error: access: unbound variable ; Error Object: phase-domain?' |
Sometimes it might happen that you can read a mesh file in FLUENT5 without any error and while reading the same in FLUENT6.0 you get following error :<br><br>Error: access: unbound... |
/usr/lib/dld.sl: Can't find path for shared library |
the Fluent Error is:<br><br>/usr/lib/dld.sl: Can't find path for shared library libXwindow.2<br>/usr/lib/dls.sl: No such file or... |
how to specify colormap label skip value in fluent 6.1 |
How to specify the number of labels that define the color divisions at the left of the graphics window?<br>Use the following scheme command:<br><br>(cxsetvar... |
How to create a particle path plot with the particles moving at a constant time step |
If you use Display->Pathlines in the "Pulse" mode, you'll notice that the particles are updated using ***different*** time steps for<br>each particle stream! This... |
How to include volatile heating value in coal combustion with EBU model |
User wanted to know how to include coal volatile heating value in a case where EBU model is used for volatile reaction<br>The volatile heating<br>value is included under... |
Fluent6 solution monitor (written to file) that reflects values from --> flux report <-- (rather than surface integrals) |
NOTE: This is provided without ANY warranty! Use at your own risk. Be prepared for this to fail under certain circumstances!<br><br>Solution monitors in FLUENT offer access to numbers... |
How to access residual levels and iteration count in a UDF |
Sometimes the iteration count and/or the residual levels need to be accessed in<br>a UDF.<br>For the iteration count, have the following variable defined:<br><br>int... |
How to orient profiles in FLUENT? |
The Orient Profile documentation is very confusing when it comes to input fields under "Orient To..." in the Orient Profile panel in FLUENT.<br>When defining Center x,y,z... |
loop over all nodes for a given face zone |
For the current release, fluent does not provide a macro to loop all the nodes for a given face zone. You could use begin_f_loop(f, tf) plus f_node_loop(f,tf,n) to achieve that. But each node... |
TUI for changing window size |
The client wants to get animation image in the same frame size for the different cases. Dragging the mouse cursor to change the window size is difficult to get the same size of the window in... |
Mass and Energy Imbalance in problems with DPM |
When you check mass balance or energy balance in the : Report -> Fluxes panel for a problem where Discret phase is coupled to the gas phase, the user will get an uneven balance.<br>In... |
How do I assign a different zone ID in TGrid? |
Running User Defined Functions in FLUENT cases often<br>requires the user to provide a zone ID.<br><br>Instead of recompiling the UDF to use it with a different<br>case... |