The Design – ANSYS Fluent Single Moving Reference Frame (SRF) Simulation | Air Liquid
In various work, we need to simulate fluid flow behavior in a device that one part or whole device is moving and this movement can be translational or rotational. In ANSYS Fluent software there is Various method for simulation of moving object and each module has some advantage and disadvantage and in some case, there is some limitation. In this post, we want to talk ability and disability of moving reference frames (MRF). This module is used for CFD simulation of translation and rotational devices (like compressors and pumps).
The advantage of this model is that work with this module is very easy and convergence is so well imposed rather than Moving mesh and dynamic mesh and also it can be used in steady mode. But in case the overall shape of the device in the fluid flow domain is varying during the time (like vertical axis wind turbine) this is module disable to simulate the whole behavior of fluid flow during the time and just be used to initial simulation and solve.
Investigating the motion of a Single Moving Reference Frame for a rotational device can greatly help to analyze the entire computational domain with referred to a moving reference frame.
In this analysis, it has been tried to simulate and analyze the airflow around a rotational device using the ANSYS Fluent software.
Geometry & Grid
The geometry required for this analysis has been generated by ANSYS Design Modeler software. The meshing required for this analysis is also generated by ANSYS Meshing software. The mesh type used in this analysis is all triangles method and the element size of body sizing for this geometry is 1.0 mm.
In this analysis, the k-epsilon (2 equation) turbulence viscosity model is used to check the fluid flow. The standard wall function is used near the wall. In this analysis, the MRF method is used to model the rotation. In this analysis, the Cell Zone Condition for the design modeler part is defined by the Frame Motion tab, and the rotational velocity speed of 50 rpm is given to the design modeler.
The momentum input for this geometry is considered as Moving Wall in Wall Motion, at a constant speed of rotational velocity is 50 m/s. The momentum of the shear condition is also considered as No Slip. The motion of the design modeler is defined as Relative to Adjacent Cell Zone for the inner fluid domain boundary condition and Absolute for the outer fluid domain boundary condition.
Discretization of Equations
According to the type of flow, the SIMPLE algorithm is used to discretize the Pressure-Velocity Coupling of the solution method. The momentum equation has been discretized in the First Order Upwind.
The results are presented as velocity and pressure contours as well as streamlines.
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