For solution of any computational fluid dynamics problem, initial and boundary conditions needs to be specified. Boundary conditions are essential component of a mathematical model. They direct the motion of flow which leads to a unique solution. In ANSYS FLUENT (or in general in any CFD software), we are familiar with standard boundary conditions such as inlet, outlet, wall, symmetry etc. These types are of boundary conditions are frequently used. But there are certain applications which require custom boundary conditions which are bit different from these standard boundary conditions. This blog will explain the use of one such “special” boundary condition called “Recirculation Boundary Condition”. This is specific to ANSYS FLUENT solver and is used for specific set of devices/problems.

Many of the advance ANSYS FLUENT users write UDF (User Defined Function) to ask ANSYS FLUENT to do some special jobs. These UDFs are very popular in ANSYS FLUENT user community. Most of the UDFs that we create are programmed for serial mode of ANSYS FLUENT since it only involves basic C program coding with required marcos. However, to utilize the power of parallel processing, we need to convert the serial UDF into parallel UDF. Read this blog for a step by step process to convert serial UDF to parallel UDF. 

Having already gone through our blog series of CFD modeling of turbomachinery, wherein we discussed about the CAD Repair and Grid Generation we shall now explore the different solver models available in a commercial software package. CFD modeling of flows within systems containing moving components (e.g. turbomachines) are performed by resorting to moving reference frames (MRF). There are a number of both generalized and specialized commercial softwares available that apply moving reference frames for both translating and rotating systems. MRF approach finds application in a wide range of systems like turbomachinery, mixing equipment, electric motors and generators, rotating passages & land and air vehicle motions. In the current blog we shall try to understand applying MRF model for turbomachinery explained with the help of a simple test case.

Hello Friends, its being a long time I haven't shared any new information on User Defined Functions (UDFs) available in ANSYS Fluent. Well that may make you think that UDFs are so tough to create, that this person took so long to write his second experience (blog) on UDF! Yeah, it’s funny, but let me tell that this is not the case with me, they (UDFs) are actually so interesting …and huge time & manual effort saver …and productive …and… I can go on and on if I start listing down all the plus points of using UDFs in Fluent. So, long story made short, I was fully enjoying past few months in learning and using this UDF & Scheme programming knowledge to Automate CFD studies in ANSYS Fluent.

Imagine you are working as a CFD Analyst/ Design Engineer in a leading automotive industry performing year round optimization studies on various aerodynamic aspects of car design. Definitely your job profile would be exciting and challenging but at the same time most of your tasks involve repetitive CFD procedures like same simulation strategy for various design changes. For such an CFD engineer automation and customization would be a great savior.

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