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(a) Under Units Conversion, select in from the Grid Was Created In drop-down list.ĭene Units. Start the 2D, double-precision (2DDP) version of FLUENT. The ow is assumed to be inviscid and the domain is axisymmetric.įigure 1: Problem Schematic of a Missile Inside the Silo Preparation1.Ĭopy the les, and silo.c to the working directory. The missile engine starts to re at t 0 seconds but the missile is held xed in the silo and is not allowed to move until t 0.1 seconds. The 6DOF solver applies Newtons law to determine the acceleration of the missile. The UDF (silo.c) is used to specify the properties of the missile (mass and moments of inertia) as well as any body forces that are present. The 6DOF solver is used to predict the motion of the missile. Problem DescriptionConsider the launch of a missile from its silo (Figure 1). If you have not used this model before, refer to Section 10.6: Dynamic Meshes in the FLUENT 6.2 Users Guide. In this section, we set parallel number of CPU core that we use in this calculation (for example, 10).PrerequisitesThis tutorial assumes that you are familiar with the FLUENT interface, and that you have a good understanding of the basic setup and solution procedures. Also, the calculation is often more unstable and slower than the MRF because the mesh is actually moved. It is easy to see the rotation velocity when visualizing the results, because the shape actually rotates.ĭisadvantages: It cannot be used for steady analysis. Also, it may be difficult to see the rotational velocity when visualizing the results because the shape does not actually rotate.īy actually rotating the mesh in the specified area, it reproduces the rotation of the shape.Īdvantages: It can be used for any flow. cross flow fan) the flow cannot be reproduced correctly. Each has the following advantages and disadvantages.īy adding the effect of rotational volume force (centrifugal force, Coriolis force) to the specified area, the rotation is simulated without rotating the shape.Īdvantages: It can be used for both steady and transient analysis, and is often more stable and faster than the Moving mesh calculations.ĭisadvantages: The flow must be rotational symmetry about the rotating area, otherwise (e.g. You can select "MRF" or "Moving mesh" as rotating type. Rotating region settings Preview rotating region in 3D view