[Puchanee]

Hello,

I'm trying to run the simulation of a pipe by using dynamic mesh only at a narrow area that has the expanded condition. As following picture

P1.jpg

Then I've tried to find a similar case to write a UDF code and found a case that has expanded condition. I tried to adapt a UDF code for my case but I faced the problems while setting up the data

During compiled: fatal error LNK1104: cannot open file 'libudf.dll'
During preview mesh motion: Update-Dynamic-Mesh failed. Negative cell volume detected.

And following is my UDF code:
Bifurcation.c

As I don't have any experience of using dynamic mesh, and I think that it should be something wrong with my UDF code but I don't know how to fix it. Therefore, could anyone please give me a suggestion or guide me for this problem? I really appreciate all your kindness.

[AlexanderZ]

was

  alpha = CURRENT_TIME;

to be

  alpha = time;

cause you have time already (defined in DEFINE_GRID_MOTION function header)

everything else looks good.
Are you sure you've compiled code?

If doesnt work, simplify "update" part of your code, for example

          if (NODE_POS_NEED_UPDATE (node_p))
            {
              NODE_POS_UPDATED (node_p);

		 NODE_Y (node_p) = 0.01;
            }

so you can check if the problem is in your coordinate dependencies or not