As an example the second derivation of the velocity component u in respect to the x-coordinate axis should be calculated: 1.)Define two expressions in the \u201cExpression\u201d tab: \u2022my ux = u.grad_x \u2022my uxx = ux.grad_x 2.)Define two additional variables of scalar type: \u2022ux [s^-1] \u2022uxx [m^-1 s^-1] 3.)Assign the defined expressions as definitions of the additional variables in the \u201cFluid Models\u201d tab of a domain. Therefor you have to choose the option \u201cAlgebraic Equation\u201d to define the additional variables. \u2022ux = my ux \u2022uxx = my uxx For further information please have a look in attached PDF-document and CFX example file.<\/p>\n
Attachments:
\n1. 2040475.zip<\/a>
\n2. Definition_of_Second_Derivation_of_a_Variable_in_CFX_Pre.pdf<\/a><\/p>\n","protected":false},"template":"","class_list":["post-178843","topic","type-topic","status-publish","hentry","topic-tag-4422","topic-tag-additional-variable","topic-tag-cfx","topic-tag-fluid-dynamics","topic-tag-general-cfx","topic-tag-second-derivation"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t