Hi,

i am trying to simulate a simple 2D domain with moving surfaces. i have a udf for describing the motion. however, im getting error while compiling udf. fluent console displays following message -

The system cannot find the file specified. (system "move user_nt.udf libudf\ntx86\2d")0 (system "copy c:\fluent.inc\6.1.21mak\fluent.inc\fluent6.1\src\m akefile_nt.udf libudf\ntx86\2d\makefile")The system cannot find the path specified. 1 (chdir "libudf")() (chdir "ntx86\2d")()

Done.

Can anyone comment on this message ?

Thanks.

Hi!

Your udf file must be in your work directory.

Regards

MATEUS

The udf is in the same working directory in which fluent session started.

Thanks

Hello,

I think maybe you build the necessary directories in the wrong way. I hope the followings might be helpful for you!

In the directory where the FLUENT session starts, build one libudf directory,then in this libudf directory build 2 directories: ntx86 und src, put your udf in the src directory, build "2d" directory in "ntx86" and make sure that makefile and user_nt.udf are copied in "2d". Now you can use "compiled udf"---build the libudf and load it. Remember you should have visual c/c++ compiler for windows. Good luck!

Hello Fluent user,

I am new to gambit and fluent and while meshing a 3d object i tried to attach the boundary layer to the face but its direction indicates towards inside instead of indicating on the outerside of domain can any one help me in this matter hoping for an early response thanks alot in advance.

Hi, Thank you for your explaination. But Fluent latest version 6.1.19 is able to build directory structure automatically as you have given.

In my case, makefile is not getting copied in "/2d" directory. I have checked the location of makefile_nt.udf & user_nt.udfin the appropriate directory as given in the fluent UDF manual. A message appears in the fluent console that "The system can not find the path specified".

Can you throw some light on this?

Thanks.

If the flow domain lies inside the surface, the direction for the boundary layer will appear on the fluid side. I can not guess how your geometry is !!However you can check in Gambit by clicking middle mouse button to toggle the selection of an entity, and then see the orientation of the boundary layer.

Hi,

I don't know how it works actually in fluent new version 6.1.19. I only work with fluent 6.1.18. In this version, the makefile_nt.udf and user_nt.udf are in the following complete path after you installed fluent:

...\fluent.inc\fluent6.1\src\makefile_nt.udf ...\fluent.inc\fluent6.1\src\user_nt.udf

May you find them in the correct directory! Regards, emma

Hi, I just forgot one small but important thing: the makefile_nt.udf and user_nt.udf must be the most up-to date files. Make sure if they are the latest files. I hope it's helpful for you!

Hi, I checked all the possibilities that you mentioned. Another thing is that we have to install VC++ on the machine on which you are working. I have loaded VC++6.0 version. I don't know what is tha latest version. I tried first with manually building the directory structure. After this, when we type command 'nmake' in MS-DOS prompt, it gives 'fatal error' message. That is why .dll file is not generating.

I think the problem may be system related. I am constantly in touch with our support engineers, eventhough, I am facing such unexpected problem.

If this gets through, I will send message to you.

Thanks for your help.

Rahul

Hi,

As a last option, I reloaded fluent 6.1.18 with VC++ 6.0 on NT machine. The UDF compilation has succeded and I can see the mesh motion.

Thanks.