{"id":27895,"date":"2017-09-27T11:19:28","date_gmt":"2017-09-27T11:19:28","guid":{"rendered":"\/forum\/forums\/topic\/specify-mixed-compositions-at-an-inlets-with-two-mixture-fractions\/"},"modified":"2017-09-27T11:19:28","modified_gmt":"2017-09-27T11:19:28","slug":"specify-mixed-compositions-at-an-inlets-with-two-mixture-fractions","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/specify-mixed-compositions-at-an-inlets-with-two-mixture-fractions\/","title":{"rendered":"Specify mixed compositions at an inlets with two mixture fractions"},"content":{"rendered":"<p><span style=\"font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 15px;\">With the Non-Premixed or Partially Premixed Combustion Models you can specify a so-called &ldquo;Secondary Stream&rdquo;. With the Secondary Stream you can model at least three different inlet compositions. In certain situations, you can model even more inlet compositions by combining streams. If you want to specify a mixture containing the Secondary Stream it is important to understand that the normalized mixture fraction (p<\/span><em style=\"box-sizing: border-box; font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 15px;\">sec) is used when the user is prompted for Secondary Mixture Fraction in the Boundary Condition Panel. For example: If you want to specify at an inlet a mixture of 50 % of Fuel Stream composition and 50 % of Secondary Stream Composition, you can write: f<\/em><span style=\"font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 15px;\">fuel + f<\/span><em style=\"box-sizing: border-box; font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 15px;\">sec + f<\/em><span style=\"font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 15px;\">ox = 1 0.5 + 0.5 = 1 and f<\/span><em style=\"box-sizing: border-box; font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 15px;\">sec = p<\/em><span style=\"font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 15px;\">sec * ( 1- f<\/span><em style=\"box-sizing: border-box; font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 15px;\">fuel ) p<\/em><span style=\"font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 15px;\">sec = f<\/span><em style=\"box-sizing: border-box; font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 15px;\">sec \/ ( 1- f<\/em><span style=\"font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 15px;\">fuel) p<\/span><em style=\"box-sizing: border-box; font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 15px;\">sec = 0.5 \/ (1-0.5) p<\/em><span style=\"font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 15px;\">sec = 1 &#8211;&gt; At the inlet boundary condition you have to specify: Mean Mixture Fraction = 0.5 Secondary Mixture Fraction = 1<\/span><\/p>\n","protected":false},"template":"","class_list":["post-27895","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"With the Non-Premixed or Partially Premixed Combustion Models you can specify a so-called \u201cSecondary Stream\u201d. 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