{"id":318630,"date":"2023-11-20T16:24:53","date_gmt":"2023-11-20T16:24:53","guid":{"rendered":"\/forum\/forums\/topic\/periodic-boundary-condition-for-droplet-evaporation\/"},"modified":"2023-11-20T16:24:53","modified_gmt":"2023-11-20T16:24:53","slug":"periodic-boundary-condition-for-droplet-evaporation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/periodic-boundary-condition-for-droplet-evaporation\/","title":{"rendered":"Periodic boundary condition for droplet evaporation"},"content":{"rendered":"

Hi there<\/p>\n

I wonder if somebody can help me with my problem<\/p>\n

In  a cubic computational domain, for the evaporation of a droplet on a hot flat surface surrounded by pressure outlet boundaries on top and front surfaces, and the behind surface side is a symmetry BC,<\/p>\n

1)for this problem, in practice, can we use periodic BC only between left and right surfaces to reduce the longitude size of the domain?
as the droplet moves in x direction when evaporating using a periodic BC can help if possible to be used<\/p>\n

I am using VOF and the model of LEE<\/p>\n

if this periodic setup is fine, 
2)what should I set as the upstream bulk temperature in the periodic setup? <\/p>\n

My initial setup as a test is as below<\/p>\n

Gravity=-9.81 in Y<\/p>\n

Boussinesq parameter: operating tempearure=the evaporation temperature<\/p>\n

Operating density method=min phase average<\/p>\n

——————————–<\/p>\n

Periodic BC setup:<\/p>\n

Pressure Gradient=0
flow direction
x=1
y=0
z=0<\/p>\n

for the upstream bulk temperature,<\/strong> I used two case studies <\/p>\n

A)a little temperature (0.15 deg) less than evaporation temp<\/p>\n

B) the same as the evaporation temp<\/p>\n

————————————<\/p>\n

coupled<\/strong> +Body force weighted<\/strong> and GeoReconstruct<\/strong>,<\/p>\n

3) is the setup you recommend for my simulation<\/p>\n

——————————————–<\/p>\n

for the above setup, I did some simulations and faced a problem around the periodic surfaces, partially we see some hot and cold spots which is not realistic (there is no heat source\/sink but the bottom hot surface with a fixed temperature) because all over the domain the temperature should not be more than the bottom fixed temperature hot base plate or less than initial\/ and pressure outlet reverse flow temperature, but in the temperature contours on the symmetric plane, in below you can see, for the case A and B there are such hot and cold temperatures which I can not understand why<\/p>\n

thanks in advance,<\/p>\n

Amir<\/p>\n

<\/p>\n","protected":false},"template":"","class_list":["post-318630","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["265142","199"],"_bbp_author_ip":["23.52.43.88"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["320"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["318630"],"_bbp_forum_id":["27796"],"_bbp_engagement":["199","265142"],"_bbp_voice_count":["2"],"_bbp_reply_count":["10"],"_bbp_last_reply_id":["342691"],"_bbp_last_active_id":["342691"],"_bbp_last_active_time":["2024-01-02 11:53:04"]},"test":"abolfazl-amiri-hezavehopen-ac-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/318630","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\/318630\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=318630"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}