Divergence detected in AMG solver - How to solve this error ?

 The "Divergence detected in AMG solver" error in ANSYS Fluent indicates that the Algebraic Multigrid (AMG) solver is struggling to converge. This can arise from several factors, including:

When to use pressure based solver and when density based solver in Ansys Fluent ?

 Choosing the right solver in ANSYS Fluent depends on the nature of your fluid flow simulation:

Pressure-Based Solver:

 * Ideal for incompressible flows (constant density) or low Mach number flows (below 0.3).

How to calculate OSI, Ig factor, Area averaged wall shear and time averaged wall shear in Ansys fluent?

Calculating the Oscillatory Shear Index (OSI), Ig factor, Area Averaged Wall Shear Stress (AAWSS), and Time Averaged Wall Shear Stress (TAWSS) in ANSYS Fluent involves several steps. Here's a general guide to help you with the process:

ERROR: The UDF library you are trying to load (libudf) is not compiled for parallel use on the current platform (win64)

This error indicates that you're trying to load a User Defined Function (UDF) library in ANSYS Fluent that wasn't compiled for parallel processing on your 64-bit Windows system (win64).

How can I prevent ANSYS Mechanical from renumbering cell zones/walls after mesh refinement, thereby ensuring my journal file remains compatible?

 ANSYS Mechanical renumbering cell zones/walls after mesh refinement is a common issue when dealing with journal files. Here are two approaches to address this:

How to define opening boundary condition in Ansys Fluent ?

 In ANSYS Fluent, an opening boundary condition, also referred to as a pressure outlet boundary condition, is used to simulate an outlet where the flow exits the computational domain. It allows the fluid to leave the domain freely without any restrictions. Here's how to define it:

How to plot bed expansion in Ansys Fluent ?

 I have simulated unsteady fluidized bed at different superficial velocities and got result. now i want to plot a graph of expansion of bed vs superficial velocity. does fluent contain any option (xy plot) ?

Fluent itself doesn't have a dedicated function to directly plot bed expansion vs. superficial velocity. However, you can achieve this by utilizing built-in features and potentially a User Defined Function (UDF) depending on your approach. Here are two methods you can consider: