Hello everyone,<\/p>\n
I am currently working on a simulation of a stirred tank using a Rushton turbine in ANSYS Fluent. The tank contains glycerin (with a density of 1260 kg\/m^3 and viscosity of 600 cP) up to 30 cm, while the total tank height is 42.5 cm with air above the glycerin. To model these two phases, I used the Volume of Fluid (VOF) approach.<\/p>\n
For the impeller rotation, I employed the sliding mesh technique. To better observe the flow dynamics, I introduced PVC particles as tracers, which have a density of 1380 kg\/m^3 and are located at the tank’s bottom. These tracer particles are modeled in Fluent using the Discrete Phase Model (DPM) with a diameter of 3mm, a mesh size of 1mm, and physical models including Saffman lift force, virtual mass force, pressure gradient force, and stochastic collision.<\/p>\n
Viscous model used was laminar as impeller Reynolds number <100.<\/p>\n
I’ve set up the simulation with SIMPLE for pressure-velocity coupling, and for spatial discretization, I’m using PRESTO! for pressure and Second Order Upwind for momentum. The volume fraction is treated with the compressive scheme, and least squares cell-based method is used. For the DPM particle injection, I used a surface injection with 18,668 particles.<\/p>\n
However, at 0.931 seconds into the simulation, I encounter a floating-point error, despite having good mesh quality (minimum orthogonal quality of 0.48 and maximum skewness of 0.48).<\/p>\n
Has anyone encountered a similar issue or does anyone have suggestions on how to resolve this floating-point error?<\/p>\n
Any help would be greatly appreciated!<\/p>\n
Thank you.<\/p>\n","protected":false},"template":"","class_list":["post-365560","topic","type-topic","status-closed","hentry","topic-tag-dpm","topic-tag-error","topic-tag-STIRREDTANK-1","topic-tag-transient"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["347976","199"],"_bbp_author_ip":["23.216.133.166"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["462"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["365560"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","347976"],"_bbp_voice_count":["2"],"_bbp_reply_count":["21"],"_bbp_last_reply_id":["366138"],"_bbp_last_active_id":["366138"],"_bbp_last_active_time":["2024-05-08 15:43:53"]},"test":"khoa-tobeo121202hcmut-edu-vn"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/365560","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\/365560\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=365560"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}