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Why am I getting a turbulent viscosity ratio warning message in the console when running a case?

The message you are seeing is more a warning than an error. It stipulates that the ratio of turbulent viscosity over the laminar viscosity is large than 1e5. While this is not an error per-say, it...

How to implement production term due to buoyancy for k-omega equations? Note that this is automatically taken into account for k-epsilon models and RSM.

These terms will be automatically taken into account in the future release.
For versions Fluent12.1 (and previous releases), use the following UDF:
It works for incompressible ideal gas option and...

How do I set the ISAT parameters in FLUENT?

The numerical error in the ISAT table is controlled by the ISAT Error Tolerance, which has a default value of 0.001. This value is relatively large, which allows faster convergence times. However,...

I get the following error when I changed my multiphase model from VOF to Eulerian in my case setup. Error:Cell_Function_Values: unrecognized function: velocity magnitude.

This error message is due to the solution monitor (Velocity magnitude of mixture), which no longer have access to mixture velocity when you use Eulerian Model. When you use VOF model, velocity is...

I get the following memory allocation error when I try to run the simulation. Error: 1000000: Failed to allocate 30.77MB memory (../../src/amg.c:4587) Error Object: #f

You get this error when you do not have sufficient memory to run the case.
Find out the cell count (Mesh->Info->Size). 1Million case needs 1GB RAM in single precision solver and 2GB RAM in...

If I change something in my UDF, how do I recompile and relink?

Compile the UDF and load it again. You may encounter an error when you try to recompile a UDF if your libudf is loaded into a case. In that case, go to Define > User-Defined > Functions >...

I get error message when I try to save the data after zone reactivation in FLUENT. Why?

If you initialize the solution after deactivating the zone, you will get error when you try to save the data file. You are not able to write the data because there is no data present for the...

My UDF compiles in Linux, but I cannot compile it in Windows. Why?

This behavior is mostly due to the fact the Visual C++ compiler is stricter with non-standard C features than the gcc compiler used in Linux. In particular, the most commonly (mis)-used extension...

Why am I getting divergence on the first iteration for an axisymmetric problem? I am running a 2d axisymmetric simulation but it diverges on the first iteration with the following message:
Divergence detected in AMG solver: x-momentum -> Increasing relaxation sweeps!
Error: Divergence detected in AMG solver: x-momentum
Error Object: #f

One reason could be that the geometry is not correct. Do a Mesh->Check to make sure you don't get
Checking for nodes that lie below the x-axis.
WARNING: Invalid axisymmetric mesh: 6 nodes lie...

How can I resolve the following error message 'WorkBench Error: Could not register files of type:Udflib' or 'Failed in handling Fluent message'?

If you have a UDF with your Fluent simulation, and your Fluent is within WB. The UDF has to be put under FFF/MECH directory, where the .msh file is saved, rather than FFF/Fluent directory....

How to get rid of following error while reading mesh in Fluent: 'grid,WARNING: no face with given nodes. Thread 2, cell 429466 Error: Build_Grid: grid error.'

Before exporting mesh for Fluent in Gambit, change parameter EXPORT_USING_UTILITY from 0 to 1.

This can be changed by going through Edit->defaults->File_IO->Fluent5

Can I read in Fluent v 6.3 case files in Fluent 6.2?

When you created a case file with Version 6.3, and then read it into version 6.2 on a different computer. You get the following error messages every time you write or read in the case...

How do I resolve the following error: FLUENT received fatal signal (ACCESS_VIOLATION)?

This is the standard error caused by FLUENT trying to access data that has not been allocated.

There are several causes which we will discuss.

For example, in a UDF, you may probe the cell...

How to resolve warning message saying the turbulent viscosity limited to viscosity ratio?

The message you are seeing is more a warning than an error. It stipulates that the ratio of turbulent viscosity over the laminar viscosity is large than 1e5.

While this is not an error per-say,...

How do I resolve the following error: Error: > (greater-than): invalid argument [2]: wrong type [not a number] Error Object: nan

This error occurs when FLUENT gets information from the Cortex (GUI). FLUENT is expecting to get the data in a specific format, but gets another. This generally occurs when FLUENT attempts to read...

Error: divergence detected in AMG solver: pressure correction---what does this mean and how do I fix the problem?

This error message is an indication that the ¬'pressure correction¬' equation is diverging. The most likely cause is that the under-relaxation factor (URF) for that equation is too...

POLYFLOW: Solve an extrusion problem by cascaded approach using csv file

There are situations when its not possible to simulate the entire geometry at one go because of mesh and memory restrictions. In extrusion/coextrusion problem sometimes the die is so long that its...

Initialisation error with solidificaiton/Melting + species Transport model

segmentation violation is encountered while initialising the case which has Solidfication with species transport model and has multiple fluid zones in V12.0.16

workaround:

Before invoking...

POLYMAT - Error: "Free store exhausted - No more memory space"

This message can be generated, although there is still planty space available. What can be done?
This could be related indeed to a lack of available disk space or memory space.
Another possible...

POLYFLOW - Trouble when invoking POLYFLOW from POLYMAN, an error message is issued "Program not found"

The trouble appears on a PC (32 or 64 bits). The complete error message is "Program not found. Check your configuration file of the environment variable POLYFLOW"
This may happen if the executable...

When converting a POLYFLOW result wia POLYDATA, the procedure stops and generates the error message "Polyflow not licensed". The conversion is not performed. What can be done?

This typically happens when the license contains only one token or when there is only one remaining token. Still, POLYDATA has already created a file whose name is convert_result;dat . The user...

POLYFLOW - Solver ends with the message "Blocs exhausted. NBLOCS > 20000 in the .p3rc file."

Some internal table is growing beyond the allowed limit. It is suggested to increase the parameter, as indicated and to rerun the calculation with the .p3rc file. If necessary, the calculation can...

POLYDATA - "Error in BBDSME; inconsistency in the data number"

Definition of a flow case with transport of species. The flux post-processor is asked on a boundary for the transported variable (menu for Concentration boundary condition). At the backend, this...

Gambit startup: "free memory is now less than 20%..." -- crash

Apparently, Gambit checks for "free" memory, disregarding the fact that "cached" memory can be counted as "free" because the OS will empty the cache (write its...

Fluent gives the following error when iterating
Error: ASSQ: invalid argument [2]: improper list
Error Object: #f

The error occurs when you have a monitor defined but no surface is selected for the monitors. The monitor could be a Force monitor or a Surface or Volume Monitor. The resolution is to check the...