[AHF]

Hi dude
i write the udf to re position the nodes on the wall . it's compile without any errors . but when i run the simulation , the error appear

Error: received a fatal signal (Segmentation fault).

this is my code :

DEFINE_GRID_MOTION(indown,domain,dt,time,dtime)
{
	face_t f;
	Thread *tf = DT_THREAD(dt);
	Node *m[11] ;
	Node *v;
	real x ;
	real y ;
	real l ;
	int n ;
	int i,j,k ;
	i = 0 ;
   
    /* set deforming flag on adjacent cell zone */
    SET_DEFORMING_THREAD_FLAG(THREAD_T0(tf));
	
    /*Message ("no node update check");*/
	begin_f_loop(f, tf) 
	{
	f_node_loop(f, tf, n) 
	{
	    v = F_NODE(f,tf,n);
	    NODE_MARK(v) = 0;
	}
	}
	end_f_loop(f, tf);

	
    begin_f_loop(f,tf)
    {
       f_node_loop(f,tf,n)
       {
			v = F_NODE(f,tf,n);
			if( NODE_MARK(v) == 0 )
			{
				NODE_MARK(v) = 1 ;
				m[i] = F_NODE(f,tf,n);
				i = i + 1 ;
			}
       }
	   
    }
    end_f_loop(f,tf) ;
	
	

	
	for ( j = 10 ;  j >= 0 ; j = j - 1)
	{
		Message (" in down 1 \n");
		
		for ( k = 0 ; k < 11; k = k + 1)
		{
			Message (" in down 2 \n");
			if(NODE_Y(m[k])<NODE_Y(m[k+1]))
			{

				Node *temp = m[k+1];

				m[k+1]=m[k];

				m[k] = temp;

			}
		}
	}
	
	for ( k = 0 ; k < 11; k = k + 1 )
		{
				NODE_POS_UPDATED(m[k]);
				x = NODE_X(m[k]);
				y = 0.005 * sin( ( 100 ) * ( x - (0.02*time) ) ) ;
				l = 0.008 - y ;
			
				NODE_Y(m[k]) = 0.008 - (l/10)*(k) ;

		}
	
 }

any help ?

[Bruno Machado]

try to add intermediate messages to check where the code crash

Message ("1");
.
.
.
.
.
Message ("2");

etc

This will help debugging