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UDF Define grid motion and Remeshing dynamic mesh

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Old   April 22, 2019, 03:38
Default UDF Define grid motion and Remeshing dynamic mesh
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nguyenhoa
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Hi everybody
I am using the udf define grid motion to move the inlet boundary according to each time step (as picture shown). But during the process, the new grid is not added. I don't understand where the problem is, the wrong udf code or something else. Please help me
my udf code:
DEFINE_GRID_MOTION(girdmotion, domain, dt, time, dtime)
{
//Definitions of the Variables
face_t f;
Node *node_p;
Thread *tf = DT_THREAD (dt);
real t = CURRENT_TIME;
real a;
int n;
SET_DEFORMING_THREAD_FLAG (THREAD_T0 (tf));
//Position Update of node_p
begin_f_loop (f, tf)
{
f_node_loop (f, tf, n)
{
node_p = F_NODE (f, tf, n);
if (NODE_POS_NEED_UPDATE (node_p))
{
NODE_POS_UPDATED (node_p);
NODE_Y (node_p) = NODE_Y (node_p)+0.035*dtime;
NODE_X (node_p) = NODE_X (node_p)+0.035*dtime;
if (NODE_Y (node_p)>0.2009)
{
NODE_Y (node_p) = 0.2009;
}
if (NODE_X (node_p)>0.446)
{
NODE_X (node_p) = 0.446;
}
}
}
}
}
end_f_loop (f, tf);
}
Attached Images
File Type: jpg grid error.jpg (131.5 KB, 20 views)
File Type: jpg geometry.jpg (34.1 KB, 19 views)
File Type: png udf define grid motion.PNG (24.1 KB, 23 views)
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Old   April 22, 2019, 20:36
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Alexander
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what does your last (third) picture means?
why do you have code in console?

best regards
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Old   April 22, 2019, 21:07
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nguyenhoa
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Quote:
Originally Posted by AlexanderZ View Post
what does your last (third) picture means?
why do you have code in console?

best regards
That is the same code as the code on console. This code is used to move the inlet as shown in Figure 2.
Please help me to solve this problem?

best regards
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Old   April 22, 2019, 21:51
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Alexander
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why do you have code in console?

how do you hook UDF?
step by step

best regards
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Old   April 22, 2019, 21:59
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Quote:
Originally Posted by AlexanderZ View Post
why do you have code in console?

how do you hook UDF?
step by step

best regards
sorry it is my bad, i forgot that i have written this code in console so i attacted the third image to show this code.
i compiled this udf in fluent, hook this udf in dynamic mesh/dynamic mesh zones/ user-define, and preview mesh motion i have recieved result like picture 2. in this picture, new grid was not created. I think the problem is in my code.

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