{"id":398168,"date":"2024-12-21T08:15:40","date_gmt":"2024-12-21T08:15:40","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/residual-convergence-challenges-for-liquid-fraction-in-wet-steam-ejector-flows\/"},"modified":"2024-12-21T08:20:31","modified_gmt":"2024-12-21T08:20:31","slug":"residual-convergence-challenges-for-liquid-fraction-in-wet-steam-ejector-flows","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/residual-convergence-challenges-for-liquid-fraction-in-wet-steam-ejector-flows\/","title":{"rendered":"Residual Convergence Challenges for Liquid Fraction in Wet Steam Ejector Flows"},"content":{"rendered":"

<p class=”MsoNormal”><span style=”font-size: 14pt;”><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>Residual Convergence Challenges for Liquid Fraction in Wet Steam Ejector Flows<\/span><\/strong><\/span><\/p><p class=”MsoNormal”><span style=”font-size: 14pt;”><\/a><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>I am currently conducting a computational fluid dynamics (CFD) simulation of wet steam flow through a Sriveerakul nozzle. The following boundary conditions have been specified:<\/span><\/span><\/p><p class=”MsoNormal” style=”mso-add-space: auto; text-indent: -.25in; mso-list: l0 level1 lfo1; tab-stops: list .5in; margin: 0in -31.5pt 0in .25in;”><span style=”font-size: 14pt;”><span style=”mso-bookmark: _Hlk185672037;”><!– [if !supportLists]–><span style=”line-height: 107%; font-family: Symbol;”><span style=”mso-list: Ignore;”>·<span style=”font-style: normal; font-variant: normal; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-weight: normal; font-stretch: normal; line-height: normal; font-family: ‘Times New Roman’;”>         <\/span><\/span><\/span><!–[endif]–><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>Multiphase Model Type<\/span><\/strong><\/span><span style=”mso-bookmark: _Hlk185672037;”><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>: the built-in wet steam model<\/span><\/span><\/span><\/p><p class=”MsoNormal” style=”mso-add-space: auto; text-indent: -.25in; mso-list: l0 level1 lfo1; tab-stops: list .5in; margin: 0in -31.5pt 0in .25in;”><span style=”font-size: 14pt;”><span style=”mso-bookmark: _Hlk185672037;”><!– [if !supportLists]–><span style=”line-height: 107%; font-family: Symbol;”><span style=”mso-list: Ignore;”>·<span style=”font-style: normal; font-variant: normal; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-weight: normal; font-stretch: normal; line-height: normal; font-family: ‘Times New Roman’;”>         <\/span><\/span><\/span><!–[endif]–><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>Turbulence Model<\/span><\/strong><\/span><span style=”mso-bookmark: _Hlk185672037;”><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>: k – ω SST<\/span><\/span><\/span><\/p><p class=”MsoNormal” style=”mso-add-space: auto; text-indent: -.25in; mso-list: l0 level1 lfo1; tab-stops: list .5in; margin: 0in -31.5pt 0in .25in;”><span style=”font-size: 14pt;”><span style=”mso-bookmark: _Hlk185672037;”><!– [if !supportLists]–><span style=”line-height: 107%; font-family: Symbol;”><span style=”mso-list: Ignore;”>·<span style=”font-style: normal; font-variant: normal; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-weight: normal; font-stretch: normal; line-height: normal; font-family: ‘Times New Roman’;”>         <\/span><\/span><\/span><!–[endif]–><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>Primary Inlet<\/span><\/strong><\/span><span style=”mso-bookmark: _Hlk185672037;”><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>: Pressure inlet at 198,665 Pa, temperature at 393.15 K, and a liquid mass fraction of 0.1%<\/span><\/span><\/span><\/p><p class=”MsoNormal” style=”mso-add-space: auto; text-indent: -.25in; mso-list: l0 level1 lfo1; tab-stops: list .5in; margin: 0in -31.5pt 0in .25in;”><span style=”font-size: 14pt;”><span style=”mso-bookmark: _Hlk185672037;”><!– [if !supportLists]–><span style=”line-height: 107%; font-family: Symbol;”><span style=”mso-list: Ignore;”>·<span style=”font-style: normal; font-variant: normal; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-weight: normal; font-stretch: normal; line-height: normal; font-family: ‘Times New Roman’;”>         <\/span><\/span><\/span><!–[endif]–><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>Secondary Inlet<\/span><\/strong><\/span><span style=”mso-bookmark: _Hlk185672037;”><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>: Pressure inlet at 1,228.18 Pa, temperature at 283.15 K, and a liquid mass fraction of 0.1%<\/span><\/span><\/span><\/p><p class=”MsoNormal” style=”mso-add-space: auto; text-indent: -.25in; mso-list: l0 level1 lfo1; tab-stops: list .5in; margin: 0in -31.5pt 0in .25in;”><span style=”font-size: 14pt;”><span style=”mso-bookmark: _Hlk185672037;”><!– [if !supportLists]–><span style=”line-height: 107%; font-family: Symbol;”><span style=”mso-list: Ignore;”>·<span style=”font-style: normal; font-variant: normal; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-weight: normal; font-stretch: normal; line-height: normal; font-family: ‘Times New Roman’;”>         <\/span><\/span><\/span><!–[endif]–><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>Outlet<\/span><\/strong><\/span><span style=”mso-bookmark: _Hlk185672037;”><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>: Pressure outlet at 3,000 Pa, temperature at 283.15 K, and a liquid mass fraction of 0.0%<\/span><\/span><\/span><\/p><p class=”MsoNormal” style=”mso-add-space: auto; text-indent: -.25in; mso-list: l0 level1 lfo1; tab-stops: list .5in; margin: 0in -31.5pt 0in .25in;”><span style=”font-size: 14pt;”><span style=”mso-bookmark: _Hlk185672037;”><!– [if !supportLists]–><span style=”line-height: 107%; font-family: Symbol;”><span style=”mso-list: Ignore;”>·<span style=”font-style: normal; font-variant: normal; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-weight: normal; font-stretch: normal; line-height: normal; font-family: ‘Times New Roman’;”>         <\/span><\/span><\/span><!–[endif]–><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>Spatial Discretization<\/span><\/strong><\/span><span style=”mso-bookmark: _Hlk185672037;”><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>: second-order upwind schemes for momentum and energy<\/span><\/span><\/span><\/p><p class=”MsoNormal” style=”mso-add-space: auto; text-indent: -.25in; mso-list: l0 level1 lfo1; tab-stops: list .5in; margin: 0in -31.5pt 0in .25in;”><span style=”font-size: 14pt;”><span style=”mso-bookmark: _Hlk185672037;”><!– [if !supportLists]–><span style=”line-height: 107%; font-family: Symbol;”><span style=”mso-list: Ignore;”>·<span style=”font-style: normal; font-variant: normal; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-weight: normal; font-stretch: normal; line-height: normal; font-family: ‘Times New Roman’;”>         <\/span><\/span><\/span><!–[endif]–><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>Pressure-Velocity Coupling Method<\/span><\/strong><\/span><span style=”mso-bookmark: _Hlk185672037;”><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>: Coupled<\/span><\/span><\/span><\/p><p class=”MsoNormal” style=”mso-add-space: auto; text-indent: -.25in; mso-list: l0 level1 lfo1; tab-stops: list .5in; margin: 0in -31.5pt 0in .25in;”><span style=”font-size: 14pt;”><span style=”mso-bookmark: _Hlk185672037;”><!– [if !supportLists]–><span style=”line-height: 107%; font-family: Symbol;”><span style=”mso-list: Ignore;”>·<span style=”font-style: normal; font-variant: normal; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-weight: normal; font-stretch: normal; line-height: normal; font-family: ‘Times New Roman’;”>         <\/span><\/span><\/span><!–[endif]–><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>Initialization<\/span><\/strong><\/span><span style=”mso-bookmark: _Hlk185672037;”><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>: hybrid initialization<\/span><\/span><\/span><\/p><p class=”MsoNormal” style=”mso-add-space: auto; text-indent: -.25in; mso-list: l0 level1 lfo1; tab-stops: list .5in; margin: 0in -31.5pt 0in .25in;”><span style=”font-size: 14pt;”><span style=”mso-bookmark: _Hlk185672037;”><!– [if !supportLists]–><span style=”line-height: 107%; font-family: Symbol;”><span style=”mso-list: Ignore;”>·<span style=”font-style: normal; font-variant: normal; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-weight: normal; font-stretch: normal; line-height: normal; font-family: ‘Times New Roman’;”>         <\/span><\/span><\/span><!–[endif]–><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>Mesh Type:<\/span><\/strong><\/span><span style=”mso-bookmark: _Hlk185672037;”><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”> structured<\/span><\/span><\/span><\/p><p class=”MsoNormal” style=”mso-add-space: auto; text-indent: -.25in; mso-list: l0 level1 lfo1; tab-stops: list .5in; margin: 0in -31.5pt 0in .25in;”><span style=”font-size: 14pt;”><span style=”mso-bookmark: _Hlk185672037;”><!– [if !supportLists]–><span style=”line-height: 107%; font-family: Symbol;”><span style=”mso-list: Ignore;”>·<span style=”font-style: normal; font-variant: normal; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-weight: normal; font-stretch: normal; line-height: normal; font-family: ‘Times New Roman’;”>         <\/span><\/span><\/span><!–[endif]–><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>Mesh Quality:<\/span><\/strong><\/span><span style=”mso-bookmark: _Hlk185672037;”><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”> Max skewness 0.36, Min orthogonality 0.84<\/span><\/span><\/span><\/p><p class=”MsoNormal” style=”text-indent: -.25in; mso-list: l0 level1 lfo1; tab-stops: list .5in; margin: 0in -31.5pt 8.0pt .25in;”><span style=”font-size: 14pt;”><span style=”mso-bookmark: _Hlk185672037;”><!– [if !supportLists]–><span style=”line-height: 107%; font-family: Symbol;”><span style=”mso-list: Ignore;”>·<span style=”font-style: normal; font-variant: normal; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-weight: normal; font-stretch: normal; line-height: normal; font-family: ‘Times New Roman’;”>         <\/span><\/span><\/span><!–[endif]–><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”>Refinement near critical regions<\/span><\/strong><\/span><span style=”mso-bookmark: _Hlk185672037;”><span style=”mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;”> (nozzle throat, shock regions, wall boundaries)<\/span><\/span><\/span><\/p><p><span style=”font-size: 14pt;”><span style=”line-height: 107%; font-family: Calibri, sans-serif;”>Despite using these conditions, the residuals for the liquid mass fraction have not converged. I would greatly appreciate any insights into potential reasons for this lack of convergence and suggestions on how to achieve a stable solution for the liquid mass fraction in wet steam simulations.<\/span><\/span><\/p><\/p>\n","protected":false},"template":"","class_list":["post-398168","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["398168"],"_bbp_author_ip":["51.81.155.236"],"_bbp_last_reply_id":["398332"],"_bbp_last_active_id":["398332"],"_bbp_last_active_time":["2024-12-23 14:38:42"],"_bbp_reply_count":["5"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["180530","199"],"_btv_view_count":["212"],"_bbp_topic_status":["unanswered"],"_edit_last":["180530"],"_bbp_revision_log":["a:2:{i:398169;a:2:{s:6:\"author\";i:180530;s:6:\"reason\";s:0:\"\";}i:398170;a:2:{s:6:\"author\";i:180530;s:6:\"reason\";s:0:\"\";}}"],"_bbp_subscription":["199","180530"]},"test":"younis_alassedi"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/398168","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":2,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/398168\/revisions"}],"predecessor-version":[{"id":398170,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/398168\/revisions\/398170"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=398168"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}