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3D_Morphing_Wing .C
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3D_Morphing_Wing .C
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/************************************************************************/
/*UDF for 3D Morphing Wing with Seamless Side-edge Transition.
Chawki Abdessemed, UWE Bristol
Up/lower = name shown in Fluent GUI
dt = thread
time = current time
dtime = time step
***/
/***********************************************************************/
#include "udf.h"
#define Thick 0.12 /*Airfoil thickness 12/100 in NACA 0012 */
#define FTT 0.20001 /*Time in s when the morphing starts*/
#define chord 0.2286 /*Airfoil chord (m)*/
DEFINE_GRID_MOTION(Up, domain, dt, time, dtime)
{
Thread *tf = DT_THREAD (dt);
face_t f;
Node *node_p;
real x, y,z,thickness,camber,theta,yupper,dy_c,xupper,W_t,T_max,Tmorph,freq,W_te,x_s,h,l,ltrans_start,ltrans_end,rtrans_start,rtrans_end;
int n;
freq = 6; /*Morphing frequency*/
Tmorph= 1/(4*freq); /*Time in s needed for the morphing*/
T_max = FTT+Tmorph; /*Flow time in s when the morphing stops*/
W_te= 0.05*chord; /*Maximum flap deflection */
x_s = 0.75*chord; /*location where the morphing starts */
h = -0.025*chord; /*h the half-amplitude of the TEF deflection*/
l = 0.05*chord; /*l the seamless transition size*/
ltrans_start = 0.3*chord; /*left transition start*/
ltrans_end = 0.35*chord; /*left transition end*/
rtrans_start = 0.65*chord; /*Right transition start*/
rtrans_end = 0.7*chord; /*Right transition end*/
/* Set/activate the deforming flag on adjacent cell zone, which */
/* means that the cells adjacent to the deforming wall will also be */
/* deformed, in order to avoid skewness. */
SET_DEFORMING_THREAD_FLAG (THREAD_T0 (tf));
/* Loop over the deforming boundary zone's faces; */
/* inner loop loops over all nodes of a given face; */
/* Thus, since one node can belong to several faces, one must guard */
/* against operating on a given node more than once: */
begin_f_loop (f, tf)
{
f_node_loop (f, tf, n)
{
node_p = F_NODE (f, tf, n);
/* Update the current node only if it has not been */
/* previously visited: */
if (NODE_POS_NEED_UPDATE (node_p))
{
/* Set flag to indicate that the current node's */
/* position has been updated, so that it will not be */
/* updated during a future pass through the loop: */
NODE_POS_UPDATED (node_p);
x = NODE_X (node_p);
z = NODE_Z (node_p);
/*definition of transition function*/
W_t = (h*cos(M_PI*z/l)-h) ;
/*Airfoil thickness distribution for NACA0012*/
thickness= (chord*Thick / 0.2) * (0.2969*sqrt(x/chord)-0.1260*x/chord-0.3516*pow((x/chord),2) + 0.2843*pow((x/chord),3)-0.1036*pow((x/chord),4));
/*Loop over the morphing portion*/
if ( x > x_s) {
if (z>ltrans_start || z< rtrans_end){
/*Define motion before T_MAX*/
if ( CURRENT_TIME >= FTT && CURRENT_TIME <= T_max) {
/*transition modeling*/
if ( z > ltrans_start && z < ltrans_end) {
camber =-(W_t*sin(2*M_PI*(CURRENT_TIME-FTT)*freq)*pow((x-x_s),3))/(pow((chord-x_s),3));
dy_c= (-3*W_t*sin(2*M_PI*(CURRENT_TIME-FTT)*freq))*pow((x-x_s),2)/(pow((chord-x_s),3));
theta = atan(((-3*W_t*sin(2*M_PI*(CURRENT_TIME-FTT)*freq))*pow((x-x_s),2)/(pow((chord-x_s),3))));
xupper = x - thickness*sin(theta);
yupper =camber + thickness*cos(theta);
NODE_Y (node_p) = yupper ;
}
if ((z > rtrans_start) && z < rtrans_end){
camber =-(W_t*sin(2*M_PI*(CURRENT_TIME-FTT)*freq)*pow((x-x_s),3))/(pow((chord-x_s),3));
dy_c= (-3*W_t*sin(2*M_PI*(CURRENT_TIME-FTT)*freq))*pow((x-x_s),2)/(pow((chord-x_s),3));
theta = atan(((-3*W_t*sin(2*M_PI*(CURRENT_TIME-FTT)*freq))*pow((x-x_s),2)/(pow((chord-x_s),3))));
xupper = x - thickness*sin(theta);
yupper =camber + thickness*cos(theta);
NODE_Y (node_p) = yupper ;
}
/*morphing flap*/
if (z >= ltrans_end && z <= rtrans_start) {
camber =-(W_te*sin(2*M_PI*(CURRENT_TIME-FTT)*freq)*pow((x-x_s),3))/(pow((chord-x_s),3));
dy_c= (-3*W_te*sin(2*M_PI*(CURRENT_TIME-FTT)*freq))*pow((x-x_s),2)/(pow((chord-x_s),3));
theta = atan(((-3*W_te*sin(2*M_PI*(CURRENT_TIME-FTT)*freq))*pow((x-x_s),2)/(pow((chord-x_s),3))));
xupper = x - thickness*sin(theta);
yupper =camber + thickness*cos(theta);
NODE_Y (node_p) = yupper ;
}
}
/* when morphing stops*/
if ( CURRENT_TIME > T_max) {
if (z > ltrans_start && z < ltrans_end) {
camber =-(W_t*sin(2*M_PI*Tmorph*freq)*pow((x-x_s),3))/(pow((chord-x_s),3));
dy_c= (-3*W_t*sin(2*M_PI*Tmorph*freq))*pow((x-x_s),2)/(pow((chord-x_s),3));
theta = atan(((-3*W_t*sin(2*M_PI*Tmorph*freq))*pow((x-x_s),2)/(pow((chord-x_s),3))));
xupper = x - thickness*sin(theta);
yupper =camber + thickness*cos(theta);
NODE_Y (node_p) = yupper ;
}
if (z > rtrans_start && z < rtrans_end){
camber =-(W_t*sin(2*M_PI*Tmorph*freq)*pow((x-x_s),3))/(pow((chord-x_s),3));
dy_c= (-3*W_t*sin(2*M_PI*Tmorph*freq))*pow((x-x_s),2)/(pow((chord-x_s),3));
theta = atan(((-3*W_t*sin(2*M_PI*Tmorph*freq))*pow((x-x_s),2)/(pow((chord-x_s),3))));
xupper = x - thickness*sin(theta);
yupper =camber + thickness*cos(theta);
NODE_Y (node_p) = yupper ;
}
if (z >= ltrans_end && z <= rtrans_start) {
camber =-(W_te*sin(2*M_PI*Tmorph*freq)*pow((x-x_s),3))/(pow((chord-x_s),3));
dy_c= (-3*W_te*sin(2*M_PI*Tmorph*freq))*pow((x-x_s),2)/(pow((chord-x_s),3));
theta = atan(((-3*W_te*sin(2*M_PI*Tmorph*freq))*pow((x-x_s),2)/(pow((chord-x_s),3))));
xupper = x - thickness*sin(theta);
yupper =camber + thickness*cos(theta);
NODE_Y (node_p) = yupper ;
}
}
}
}
}
end_f_loop (f, tf);
}
}
}
DEFINE_GRID_MOTION(Down, domain, dt, time, dtime)
{
Thread *tf = DT_THREAD (dt);
face_t f;
Node *node_p;
real x, y,z,thickness,camber,theta,yupper,dy_c,xupper,W_t,T_max,Tmorph,freq,W_te,x_s,h,l,ltrans_start,ltrans_end,rtrans_start,rtrans_end;
int n;
freq = 6; /*Morphing frequency*/
Tmorph= 1/(4*freq); /*Time in s needed for the morphing*/
T_max = FTT+Tmorph; /*Flow time in s when the morphing stops*/
W_te= 0.05*chord; /*Maximum flap deflection */
x_s = 0.75*chord; /*location where the morphing starts */
h = -0.025*chord; /*h the half-amplitude of the TEF deflection*/
l = 0.05*chord; /*l the seamless transition size*/
ltrans_start = 0.3*chord; /*left transition start*/
ltrans_end = 0.35*chord; /*left transition end*/
rtrans_start = 0.65*chord; /*Right transition start*/
rtrans_end = 0.7*chord; /*Right transition end*/
/* Set/activate the deforming flag on adjacent cell zone, which */
/* means that the cells adjacent to the deforming wall will also be */
/* deformed, in order to avoid skewness. */
SET_DEFORMING_THREAD_FLAG (THREAD_T0 (tf));
/* Loop over the deforming boundary zone's faces; */
/* inner loop loops over all nodes of a given face; */
/* Thus, since one node can belong to several faces, one must guard */
/* against operating on a given node more than once: */
begin_f_loop (f, tf)
{
f_node_loop (f, tf, n)
{
node_p = F_NODE (f, tf, n);
/* Update the current node only if it has not been */
/* previously visited:
*/
if (NODE_POS_NEED_UPDATE (node_p))
{
/* Set flag to indicate that the current node's */
/* position has been updated, so that it will not be */
/* updated during a future pass through the loop: */
NODE_POS_UPDATED (node_p);
x = NODE_X (node_p);
z = NODE_Z (node_p);
/*definition of transition function*/
W_t = (h*cos(M_PI*z/l)-h) ;
/*Airfoil thickness distribution */
thickness= (chord*Thick / 0.2) * (0.2969*sqrt(x/chord)-0.1260*x/chord-0.3516*pow((x/chord),2) + 0.2843*pow((x/chord),3)-0.1036*pow((x/chord),4));
if ( x > x_s) {
if (z>ltrans_start || z< rtrans_end){
if ( CURRENT_TIME>=FTT && CURRENT_TIME <= T_max) {
if ( z > ltrans_start && z < ltrans_end) {
camber =-(W_t*sin(2*M_PI*(CURRENT_TIME-FTT)*freq)*pow((x-x_s),3))/(pow((chord-x_s),3));
dy_c= (-3*W_t*sin(2*M_PI*(CURRENT_TIME-FTT)*freq))*pow((x-x_s),2)/(pow((chord-x_s),3));
theta = atan(((-3*W_t*sin(2*M_PI*(CURRENT_TIME-FTT)*freq))*pow((x-x_s),2)/(pow((chord-x_s),3))));
xlower = x + thickness*sin(theta);
lower= camber - thickness*cos(theta);
NODE_Y (node_p) = lower ;
}
if (z > rtrans_start && z < rtrans_end){
camber =-(W_t*sin(2*M_PI*(CURRENT_TIME-FTT)*freq)*pow((x-x_s),3))/(pow((chord-x_s),3));
dy_c= (-3*W_t*sin(2*M_PI*(CURRENT_TIME-FTT)*freq))*pow((x-x_s),2)/(pow((chord-x_s),3));
theta = atan(((-3*W_t*sin(2*M_PI*(CURRENT_TIME-FTT)*freq))*pow((x-x_s),2)/(pow((chord-x_s),3))));
xlower = x + thickness*sin(theta);
lower= camber - thickness*cos(theta);
NODE_Y (node_p) = lower ;
}
if (z >= ltrans_end && z <= rtrans_start) {
camber =-(W_te*sin(2*M_PI*(CURRENT_TIME-FTT)*freq)*pow((x-x_s),3))/(pow((chord-x_s),3));
dy_c= (-3*W_te*sin(2*M_PI*(CURRENT_TIME-FTT)*freq))*pow((x-x_s),2)/(pow((chord-x_s),3));
theta = atan(((-3*W_te*sin(2*M_PI*(CURRENT_TIME-FTT)*freq))*pow((x-x_s),2)/(pow((chord-x_s),3))));
xlower = x + thickness*sin(theta);
lower= camber - thickness*cos(theta);
NODE_Y (node_p) = lower ;
}
/*stops*/
}
if ( CURRENT_TIME >= T_max) {
if (z > ltrans_start && z < ltrans_end) {
camber =-(W_t*sin(2*M_PI*Tmorph*freq)*pow((x-x_s),3))/(pow((chord-x_s),3));
dy_c= (-3*W_t*sin(2*M_PI*Tmorph*freq))*pow((x-x_s),2)/(pow((chord-x_s),3));
theta = atan(((-3*W_t*sin(2*M_PI*Tmorph*freq))*pow((x-x_s),2)/(pow((chord-x_s),3))));
xlower = x + thickness*sin(theta);
lower= camber - thickness*cos(theta);
NODE_Y (node_p) = lower ;
}
if (z > rtrans_start && z < rtrans_end){
camber =-(W_t*sin(2*M_PI*Tmorph*freq)*pow((x-x_s),3))/(pow((chord-x_s),3));
dy_c= (-3*W_t*sin(2*M_PI*Tmorph*freq))*pow((x-x_s),2)/(pow((chord-x_s),3));
theta = atan(((-3*W_t*sin(2*M_PI*Tmorph*freq))*pow((x-x_s),2)/(pow((chord-x_s),3))));
xlower = x + thickness*sin(theta);
lower= camber - thickness*cos(theta);
NODE_Y (node_p) = lower ;
}
if (z >= ltrans_end && z <= rtrans_start) {
camber =-(W_te*sin(2*M_PI*Tmorph*freq)*pow((x-x_s),3))/(pow((chord-x_s),3));
dy_c= (-3*W_te*sin(2*M_PI*Tmorph*freq))*pow((x-x_s),2)/(pow((chord-x_s),3));
theta = atan(((-3*W_te*sin(2*M_PI*Tmorph*freq))*pow((x-x_s),2)/(pow((chord-x_s),3))));
xlower = x + thickness*sin(theta);
lower= camber - thickness*cos(theta);
NODE_Y (node_p) = lower ;
}
}
}
}
}
end_f_loop (f, tf);
}
}
}
/*********************************************************************/
/* */
/* End of the UDF. */
/* */
/*********************************************************************/