{"id":393287,"date":"2024-11-08T10:05:36","date_gmt":"2024-11-08T10:05:36","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/total-pressure-data-of-the-simulation-is-not-correct\/"},"modified":"2024-11-08T10:05:36","modified_gmt":"2024-11-08T10:05:36","slug":"total-pressure-data-of-the-simulation-is-not-correct","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/total-pressure-data-of-the-simulation-is-not-correct\/","title":{"rendered":"Total pressure data of the simulation is not correct."},"content":{"rendered":"

<p><span style=”font-size: 12pt;”>I have simulated a Supersonic Jet Flow – Convergent-Divergent nozzle<\/span><\/p><p><span style=”font-size: 12pt;”>First, the geometry was used without settling chamber but after analyzing the pressure plot a settling chamber was introduced to match exactly as experiment but still the total pressure plot is wrong. <\/span><\/p><p><span style=”font-size: 12pt;”>1). Boundary conditions used are as follows:<\/span><\/p><p><span style=”font-size: 12pt;”>Settling Chamber Inlet: Pressure Inlet, Total Pressure= 253312.5 Pa & Initial Gauge Pressure = 233312.5 Pa, Total Temp = 300K<\/span><\/p><p><span style=”font-size: 12pt;”>Far-Field Boundary: Pressure Far-Field, Gauge Pressure = 0, Mach = 0.01<\/span><\/p><p><span style=”font-size: 12pt;”>Outlet: Pressure Outlet, Gauge Pressure = 0, Backflow Pressure = Total Pressure<\/span><\/p><p><span style=”font-size: 12pt;”>Operating Pressure = 101325 Pa<\/span><\/p><p><span style=”font-size: 12pt;”>2). Another simulation has been done and boundary conditions used are as follows:<\/span><\/p><p><span style=”font-size: 12pt;”>Settling Chamber Inlet: Pressure Inlet, Total Pressure= 253312.5 Pa & Initial Gauge Pressure = 0 Pa, Total Temp = 300K<\/span><\/p><p><span style=”font-size: 12pt;”>Far-Field Boundary: Pressure Far-Field, Gauge Pressure = 0, Mach = 0.01<\/span><\/p><p><span style=”font-size: 12pt;”>Outlet: Pressure Outlet, Gauge Pressure = 0, Backflow Pressure = Total Pressure<\/span><\/p><p><span style=”font-size: 12pt;”>Operating Pressure = 101325 Pa<\/span><\/p><p><span style=”font-size: 12pt;”>3). Another simulation has been done using these Boundary conditions:<\/span><\/p><p><span style=”font-size: 12pt;”>Settling Chamber Inlet: Pressure Inlet, Total Pressure= 253312.5 Pa & Initial Gauge Pressure = 250312.5 Pa, Total Temp = 300K<\/span><\/p><p><span style=”font-size: 12pt;”>Far-Field Boundary: Pressure Far-Field, Gauge Pressure = 0, Mach = 0.01<\/span><\/p><p><span style=”font-size: 12pt;”>Outlet: Pressure Outlet, Gauge Pressure = 0, Backflow Pressure = Total Pressure<\/span><\/p><p><span style=”font-size: 12pt;”>Operating Pressure = 101325 Pa<\/span><\/p><p><span style=”font-size: 12pt;”>Note: Density-Based Steady Solver, SST-kw Model with Low Reynolds Correction, Implicit Formulation, Roe-FDS Flux type and LSCB & Second order Upwind discretization method was adopted.<\/span><\/p><p><span style=”font-size: 12pt;”>Mesh Element: Firstly, 300000 mesh elements were taken but after not getting satisfactory results, number of mesh element was increased 2 to 3 times. In the last simulation, mesh element was about 17Lakhs (1.7M). Fine mesh element (10^-6 m) distributed in near wall region.<\/span><\/p><p><span style=”font-size: 12pt;”>Pseudo Time Method = off : Hybrid Initialization Method adopted<\/span><\/p><p><span style=”font-size: 12pt;”>Solution Steering = On, Used FMG Initialization, Courant Number= 1 to 5<\/span><\/p><p> <\/p><p><span style=”font-size: 12pt;”>Please help me and suggest what is wrong here in my simulation and boundary condition.<\/span><\/p><p><span style=”font-size: 12pt;”>Please also suggest the correct boundary condition Parameters for NPR = 2.5, 4 <\/span><span style=”font-size: 12pt;”>& 6<\/span><\/p><p>\"Mesh\"Mach<\/p><p>\"Total\"Published<\/p><\/p>\n","protected":false},"template":"","class_list":["post-393287","topic","type-topic","status-publish","hentry","topic-tag-c-d-nozzle-2","topic-tag-SupersonicNozzleFlow-1","topic-tag-total-pressure"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["478954","8124"],"_bbp_author_ip":["117.250.64.129"],"_btv_view_count":["719"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["393287"],"_bbp_forum_id":["27792"],"_bbp_engagement":["478954","8124"],"_bbp_voice_count":["2"],"_bbp_reply_count":["7"],"_bbp_last_reply_id":["395721"],"_bbp_last_active_id":["395721"],"_bbp_last_active_time":["2024-11-29 09:11:28"]},"test":"am-23me1105phd-nitdgp-ac-in"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/393287","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\/393287\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=393287"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}