Hi community, I would ask a question about density distribution with UDF file.<\/p>\n
I’m trying to simulate the falling descent of a solid body in air with overset mesh and 6-dof solver. Everithing is well setted up and if i use a constant value for the solid density in fluent no problems occurs.<\/p>\n
I would like to consider a body with different density distribution, for example rho = 40 if the cell thickness is below a threshold and rho =430 if it is above. I’ve write the following UDF and fluent allow to compile and assign to the material density, but when i look at the density contours in CFD post the value on the solid body is uniform and equal to 1.225 (air density). How can I check the real density of the solid ? <\/p>\n
UDF:<\/p>\n
#include “udf.h”<\/p>\n
DEFINE_PROPERTY(density, c, t)
{
real ro;
real x[ND_ND];
real thickness;
int isWallObject;
Domain* domain;<\/p>\n
\/* Ottieni il dominio *\/
domain = Get_Domain(1);<\/p>\n
\/* Verifica se la faccia è associata alla name selection “wall-object” *\/
isWallObject = (C_FACE_THREAD(c, t) == Lookup_Thread(domain, “wall-object”)) ? 1 : 0;<\/p>\n
if (isWallObject)
{
C_CENTROID(x, c, t);
thickness = C_VOLUME(c, t) \/ C_FACE_AREA(c, t);<\/p>\n
if (thickness < 0.000353)
ro = 40;
else
ro = 430;
}
else
{
ro = 1.225;
}<\/p>\n
return ro;
}<\/p>\n
<\/p>\n
Many thanks<\/p>\n","protected":false},"template":"","class_list":["post-346749","topic","type-topic","status-closed","hentry","topic-tag-fluent-cfd-ansys-1","topic-tag-overset-mesh","topic-tag-user-defined-functions"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["275015","199"],"_bbp_author_ip":["23.52.43.16"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["679"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["346749"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","275015"],"_bbp_voice_count":["2"],"_bbp_reply_count":["12"],"_bbp_last_reply_id":["347265"],"_bbp_last_active_id":["347265"],"_bbp_last_active_time":["2024-01-30 11:41:07"]},"test":"alberto-lollisantannapisa-it"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/346749","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/346749\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=346749"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}