{"id":54,"date":"2011-05-24T08:27:22","date_gmt":"2011-05-24T00:27:22","guid":{"rendered":"http:\/\/101.37.83.176\/?p=54"},"modified":"2022-09-07T17:29:19","modified_gmt":"2022-09-07T09:29:19","slug":"cfx","status":"publish","type":"post","link":"http:\/\/101.37.83.176\/?p=54","title":{"rendered":"CFX\u6570\u503c\u98ce\u6d1e\u6a21\u62df\u8303\u4f8b"},"content":{"rendered":"

\u00a9 Written by J.Y. WANG<\/span><\/a><\/p>\n

\u6570\u503c\u98ce\u6d1e\u6a21\u62df\u8303\u4f8b\u2014\u2014<\/strong><\/p>\n

\u4ec5CFX\u524d\u5904\u7406\u53ca\u6c42\u89e3\u5b9a\u4e49\u90e8\u5206<\/strong><\/p>\n\n\n\n\n
 \"\"<\/a><\/strong><\/td>\n<\/tr>\n
\n

CFD<\/strong>\u6570\u503c\u6a21\u62df\u8fc7\u7a0b<\/strong><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

CFX<\/strong>\u524d\u5904\u7406\u53ca\u6c42\u89e3\u5b9a\u4e49\uff1a<\/strong><\/p>\n

1.<\/strong>\u5bfc\u5165\u7f51\u683c\uff08Import Mesh\uff09<\/strong><\/p>\n

2.<\/strong>\u5b9a\u4e49\u6a21\u62df\u7c7b\u578b\uff08Simulation Type\uff09<\/strong><\/p>\n

3.<\/strong>\u521b\u5efa\u8ba1\u7b97\u57df\uff08Domain\uff09<\/strong><\/p>\n

4.<\/strong>\u6307\u5b9a\u8fb9\u754c\u6761\u4ef6\uff08Boundary Condition\uff09<\/strong><\/p>\n

5.<\/strong>\u7ed9\u51fa\u521d\u59cb\u6761\u4ef6\uff08Initial Conditions\uff09<\/strong><\/p>\n

6.<\/strong>\u5b9a\u4e49\u6c42\u89e3\u63a7\u5236\uff08Solver Control\uff09<\/strong><\/p>\n

7.<\/strong>\u5b9a\u4e49\u8f93\u51fa\u6570\u636e\uff08Output File & Monitor Points\uff09<\/strong><\/p>\n

8.<\/strong>\u5199\u5165\u5b9a\u4e49\u6587\u4ef6\uff08.def File\uff09\u5e76\u6c42\u89e3<\/strong><\/p>\n

Starting CFX-Pre<\/strong><\/p>\n

1.  Prepare the working directory using the following files in the examples<\/code> directory:<\/p>\n

    \n
  • WindProfile.ccl<\/code><\/li>\n
  • BluntBodyMesh.gtm<\/li>\n<\/ul>\n

    2.  Set the working directory and start CFX-Pre.<\/p>\n

    Defining a Case in CFX-Pre<\/strong><\/p>\n

    1.  In CFX-Pre, select File<\/strong> > New Case<\/strong>.<\/p>\n

    2.  Select General<\/strong> and click OK<\/strong>.<\/p>\n

    3.  Select File<\/strong> > Save Case As<\/strong>.<\/p>\n

    4.  Under File name<\/strong>, type BluntBody<\/code>.<\/p>\n

    5.  Click Save<\/strong>.<\/p>\n

    Importing the Mesh <\/strong><\/p>\n

      \n
    1. Edit Case Options > General in the Outline<\/strong> tree view and ensure that Automatic Default Domain<\/strong> is turned off.<\/li>\n<\/ol>\n

      Default Domain generation should be turned off because you will create a new domain manually, later in this tutorial.<\/p>\n

        \n
      1. Right-click Mesh and select Import Mesh<\/strong> > Other<\/strong>. The Import Mesh<\/strong> dialog box appears.<\/li>\n
      2. Apply the following settings:<\/li>\n<\/ol>\n\n\n\n\n\n
        Setting<\/strong><\/td>\nValue<\/strong><\/td>\n<\/tr>\n<\/thead>\n
        File name<\/td>\nBluntBodyMesh.gtm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
          \n
        1. Click Open<\/strong>.<\/li>\n<\/ol>\n

          Importing CEL Expressions<\/h3>\n

          1.  Select File<\/strong> > Import<\/strong> > CCL<\/strong>.<\/p>\n

          2.  Ensure that Import Method<\/strong> is set to Append<\/strong>.<\/p>\n

          3.  Select WindProfile.ccl<\/code>, which should be in your working directory.<\/p>\n

          4.  Click Open<\/strong>.<\/p>\n

          LIBRARY:<\/p>\n

          CEL:<\/p>\n

          EXPRESSIONS:<\/p>\n

          zb = 10 [m]<\/p>\n

          ub = 29.2 [m s^-1]<\/p>\n

          Ht = 350 [m]<\/p>\n

          Lu = 30 [m]<\/p>\n

          alpha = 0.16 []<\/p>\n

          uz = if( z>zb, ub*((z+0.00001[m])\/zb)^alpha, ub )<\/p>\n

          Iz = if( z>zb, 0.1*(Ht\/(z+0.00001[m]))^(alpha+0.05), 0.31 )<\/p>\n

          kz = 1.5*(Iz*uz)^2<\/p>\n

          ez = 0.09^0.75*(kz^1.5)\/Lu<\/p>\n

          END<\/p>\n

          END<\/p>\n

          END<\/p>\n

          Setting the Analysis Type<\/h3>\n
            \n
          1. Click Analysis Type<\/em>.<\/li>\n
          2. Apply the following settings:<\/li>\n<\/ol>\n\n\n\n\n\n
            Tab<\/strong><\/td>\nSetting<\/strong><\/td>\nValue<\/strong><\/td>\n<\/tr>\n<\/thead>\n
            Basic Settings<\/td>\nAnalysis Type > Option<\/td>\nSteady State<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
              \n
            1. Click OK<\/strong>.<\/li>\n<\/ol>\n

              Creating the Domain<\/h3>\n
                \n
              1. Ensure that Flow Analysis 1 > Default Domain is deleted. If not, right-click Default Domain and select Delete<\/strong>.<\/li>\n
              2. Click Domain<\/em>, and set the name to BluntBody.<\/li>\n
              3. Apply the following settings to BluntBody:<\/li>\n<\/ol>\n\n\n\n\n\n\n\n\n\n\n\n
                Tab<\/strong><\/td>\nSetting<\/strong><\/td>\nValue<\/strong><\/td>\n<\/tr>\n<\/thead>\n
                Basic Settings<\/td>\nLocation and Type > Location<\/td>\nFluid<\/td>\n<\/tr>\n
                Fluid and Particle Definitions<\/td>\nFluid 1<\/td>\n<\/tr>\n
                Fluid and Particle Definitions > Fluid 1 > Material<\/td>\nAir Ideal Gas<\/td>\n<\/tr>\n
                Domain Models > Pressure > Reference Pressure<\/td>\n1 [atm]<\/td>\n<\/tr>\n
                Fluid Models<\/td>\nHeat Transfer > Option<\/td>\nIsothermal<\/td>\n<\/tr>\n
                Heat Transfer > Fluid Temperature<\/td>\n20 [C]<\/td>\n<\/tr>\n
                Turbulence > Option<\/td>\nShear Stress Transport<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                Creating the Boundaries<\/h3>\n

                Inlet Boundary<\/h3>\n

                1.  Click Boundary<\/em>.<\/p>\n

                2.  Under Name<\/strong>, type Inlet<\/code>.<\/p>\n

                3.  Apply the following settings:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
                Tab<\/strong><\/td>\nSetting<\/strong><\/td>\nValue<\/strong><\/td>\n<\/tr>\n<\/thead>\n
                Basic Settings<\/td>\nBoundary Type<\/td>\nInlet<\/td>\n<\/tr>\n
                Location<\/td>\nInlet<\/td>\n<\/tr>\n
                Boundary Details<\/td>\nFlow Regime > Option<\/td>\nSubsonic<\/td>\n<\/tr>\n
                Mass and Momentum > Option<\/td>\nCart. Vel. Components<\/td>\n<\/tr>\n
                Mass and Momentum > U<\/td>\nuz<\/td>\n<\/tr>\n
                Mass and Momentum > V<\/td>\n0 [m s^-1]<\/td>\n<\/tr>\n
                Mass and Momentum > W<\/td>\n0 [m s^-1]<\/td>\n<\/tr>\n
                Turbulence > Option<\/td>\nk and Epsilon<\/td>\n<\/tr>\n
                Turbulence > Turb. Kinetic Energy<\/td>\nkz<\/td>\n<\/tr>\n
                Turbulence > Turb. Eddy Dissipation<\/td>\nez<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                4.  Click OK<\/strong>.<\/p>\n

                Outlet Boundary<\/h3>\n

                1.  Create a new boundary named Outlet<\/code>.<\/p>\n

                2.  Apply the following settings:<\/p>\n\n\n\n\n\n\n\n\n\n\n
                Tab<\/strong><\/td>\nSetting<\/strong><\/td>\nValue<\/strong><\/td>\n<\/tr>\n<\/thead>\n
                Basic Settings<\/td>\nBoundary Type<\/td>\nOutlet<\/td>\n<\/tr>\n
                Location<\/td>\nOutlet<\/td>\n<\/tr>\n
                Boundary Details<\/td>\nMass and Momentum > Option<\/td>\nOpening Pres. And Dirn<\/td>\n<\/tr>\n
                Mass and Momentum > Relative Pressure<\/td>\n0 [Pa]<\/td>\n<\/tr>\n
                Flow Direction > Option<\/td>\nNormal to Boundary Condition<\/td>\n<\/tr>\n
                Turbulence > Option<\/td>\nZero Gradient<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                3.  Click OK<\/strong>.<\/p>\n

                Free-Slip Wall Boundary<\/h3>\n

                1.  Create a new boundary named FreeWalls<\/code>.<\/p>\n

                2.  Apply the following settings:<\/p>\n\n\n\n\n\n\n\n
                Tab<\/strong><\/td>\nSetting<\/strong><\/td>\nValue<\/strong><\/td>\n<\/tr>\n<\/thead>\n
                Basic Settings<\/td>\nBoundary Type<\/td>\nWall<\/td>\n<\/tr>\n
                Location<\/td>\nFreeWalls<\/td>\n<\/tr>\n
                Boundary Details<\/td>\nMass and Momentum > Option<\/td>\nFree Slip Wall<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                3.  Click OK<\/strong>.<\/p>\n

                Wall Boundary on the Blunt Body Surface<\/h3>\n

                1.  Create a new boundary named Body<\/code>.<\/p>\n

                2.  Apply the following settings:<\/p>\n\n\n\n\n\n\n\n
                Tab<\/strong><\/td>\nSetting<\/strong><\/td>\nValue<\/strong><\/td>\n<\/tr>\n<\/thead>\n
                Basic Settings<\/td>\nBoundary Type<\/td>\nWall<\/td>\n<\/tr>\n
                Location<\/td>\nBody<\/td>\n<\/tr>\n
                Boundary Details<\/td>\nMass and Momentum > Option<\/td>\nNo Slip Wall<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                3.  Click OK<\/strong>.<\/p>\n

                Setting Initial Values <\/strong><\/p>\n

                The initial conditions are consistent with inlet boundaries.<\/p>\n

                  \n
                1. Click Global Initialization<\/em> .<\/li>\n
                2. Apply the following settings:<\/li>\n<\/ol>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
                  Tab<\/strong><\/td>\nSetting<\/strong><\/td>\nValue<\/strong><\/td>\n<\/tr>\n<\/thead>\n
                   <\/td>\nInitial Conditions > Cartesian Velocity Components > Option<\/td>\nAutomatic with Value<\/td>\n<\/tr>\n
                   <\/td>\nInitial Conditions > Cartesian Velocity Components > U<\/td>\nuz<\/td>\n<\/tr>\n
                   <\/td>\nInitial Conditions > Cartesian Velocity Components > V<\/td>\n0 [m s^-1]<\/td>\n<\/tr>\n
                   <\/td>\nInitial Conditions > Cartesian Velocity Components > W<\/td>\n0 [m s^-1]<\/td>\n<\/tr>\n
                   <\/td>\nInitial Conditions > Static Pressure > Option<\/td>\nAutomatic with Value<\/td>\n<\/tr>\n
                   <\/td>\nInitial Conditions > Static Pressure > Relative Pressure<\/td>\n0 [Pa]<\/td>\n<\/tr>\n
                   <\/td>\nInitial Conditions > Turbulence > Option<\/td>\nk and Epsilon<\/td>\n<\/tr>\n
                  Global Settings<\/td>\nInitial Conditions > Turbulence > Turbulence Kinetic Energy > Option<\/td>\nAutomatic with Value<\/td>\n<\/tr>\n
                  Initial Conditions > Turbulence > Turbulence Kinetic Energy > Value<\/td>\nkz<\/td>\n<\/tr>\n
                  Initial Conditions > Turbulence > Turbulence Eddy Dissipation > Option<\/td>\nAutomatic with Value<\/td>\n<\/tr>\n
                  Initial Conditions > Turbulence > Turbulence Eddy Dissipation > Value<\/td>\nez<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
                    \n
                  1. Click OK<\/strong>.<\/li>\n<\/ol>\n

                    Setting Solver Control <\/strong><\/p>\n

                      \n
                    1. Click Solver Control<\/em> .<\/li>\n
                    2. Apply the following settings:<\/li>\n<\/ol>\n\n\n\n\n\n\n\n\n\n\n\n
                      Tab<\/strong><\/td>\nSetting<\/strong><\/td>\nValue<\/strong><\/td>\n<\/tr>\n<\/thead>\n
                       <\/td>\nAdvection Scheme > Option<\/td>\nSpecified Blend Factor<\/td>\n<\/tr>\n
                       <\/td>\nAdvection Scheme > Blend Factor<\/td>\n0.75<\/td>\n<\/tr>\n
                       <\/td>\nTurbulence Numerics > Option<\/td>\nHigh Resolution<\/td>\n<\/tr>\n
                      Basic Settings<\/td>\nConvergence Control > Max. Iterations<\/td>\n100<\/td>\n<\/tr>\n
                      Convergence Control > Fluid Timescale Control > Timescale Control<\/td>\nPhysical Timescale<\/td>\n<\/tr>\n
                      Convergence Control > Fluid Timescale Control > Physical Timescale<\/td>\n2 [s]<\/td>\n<\/tr>\n
                      Convergence Criteria > Residual Target<\/td>\n1e-05<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
                        \n
                      1. Click OK<\/strong>.<\/li>\n<\/ol>\n

                        Obtaining a Solution in Serial<\/h3>\n

                        1.  Click Start Run<\/strong>.<\/p>\n

                        2.  When CFX-Solver is finished, select the check box next to Post-Process Results<\/strong>.<\/p>\n

                        3.  If using Standalone Mode, select the check box next to Shut down CFX-Solver Manager<\/strong>.<\/p>\n

                        4.  Click OK<\/strong>.<\/p>\n

                        Obtaining a Solution with Local Parallel<\/h4>\n

                        To run in local parallel mode, the machine you are on must have more than one processor.<\/p>\n

                        In CFX-Solver Manager, the Define Run<\/strong> dialog box should already be open.<\/p>\n

                        1.  Leave Type of Run<\/strong> set to Full<\/code>.<\/p>\n

                        If Type of Run<\/strong> was instead set to Partitioner Only<\/code>, your mesh would be split into a number of partitions but would not be run in the CFX-Solver afterwards.<\/p>\n

                        2.  Set Run Mode<\/strong> to a parallel mode suitable for your configuration; for example, HP MPI Local Parallel<\/code>.<\/p>\n

                        This is the recommended method for most applications.<\/p>\n

                        3.  If required, click Add Partition<\/em> to add more partitions.<\/p>\n

                        By default, 2 partitions are assigned.<\/p>\n

                        4.  Select Show Advanced Controls<\/strong>.<\/p>\n

                        5.  Click the Partitioner<\/strong> tab at the top of the dialog box.<\/p>\n

                        6.  Use the default MeTiS<\/code> partitioner.<\/p>\n

                        Your model will be divided into two sections, with each section running in its own CFX-Solver process. The default is the MeTiS<\/code> partitioner because it produces more efficient partitions than either Recursive Coordinate Bisection<\/code> or User Specified Direction<\/code>.<\/p>\n

                        7.  Click Start Run<\/strong>.<\/p>\n

                        8.  When CFX-Solver is finished, select the check box next to Post-Process Results<\/strong>.<\/p>\n

                        9.  If using Standalone Mode, select the check box next to Shut down CFX-Solver Manager<\/strong>.<\/p>\n

                        10. Click OK<\/strong>.<\/p>\n

                         <\/h3>\n","protected":false},"excerpt":{"rendered":"

                        CFX\u6570\u503c\u98ce\u6d1e\u6a21\u62df\u8303\u4f8b<\/p>\n","protected":false},"author":1,"featured_media":55,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[72],"tags":[12,14,13,17],"class_list":["post-54","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analysis","tag-cfd","tag-cfx","tag-numerical-simulation","tag-wind-tunnel"],"_links":{"self":[{"href":"http:\/\/101.37.83.176\/index.php?rest_route=\/wp\/v2\/posts\/54","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/101.37.83.176\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/101.37.83.176\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/101.37.83.176\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/101.37.83.176\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=54"}],"version-history":[{"count":0,"href":"http:\/\/101.37.83.176\/index.php?rest_route=\/wp\/v2\/posts\/54\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/101.37.83.176\/index.php?rest_route=\/wp\/v2\/media\/55"}],"wp:attachment":[{"href":"http:\/\/101.37.83.176\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=54"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/101.37.83.176\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=54"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/101.37.83.176\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=54"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}