CFX Transient Structural Analysis on Linux without GPU: Workarounds and Tips

 Absolutely, I can help you with running CFX coupled transient structural analysis on Linux without a GPU.

Visualization on Linux for Transient Structures:

Ansys Fluent: Modeling Thin Ducts in Large Air Conditioner Domain

 Entering a small thickness like 1.5 mm into a large domain in ANSYS Fluent can be challenging due to meshing limitations and potential contact issues. Here are some approaches to consider:

Ansys Fluent: Modifying DPM Sample Output Number Format

 Unfortunately, ANSYS Fluent doesn't offer a direct way to modify the number format for DPM (Discrete Phase Model) sample output. The output format is typically fixed in scientific notation (e.g., 1.1e+00).

Here are some alternative approaches you can consider:

Learning: From Free Body Diagram to Characteristic Equation: Solving Beam Vibration Problems

 Here's a breakdown to solve beam vibration problem of the general process after obtaining the equations from your free body diagram:

Comprehensive Solar Radiation Modeling for Ansys Fluent Simulations

The DTRM model likely focuses on illumination parameters relevant for visible light rather than the entire solar radiation spectrum. Here's how to provide a more comprehensive input model for solar radiation in Ansys Fluent:

Unsteady Bubble Velocity in VOF-DPM Simulation with UDF

 

It sounds like you're encountering an unphysical increase in velocity for your bubble as it reaches the surface in your VOF-DPM coupled simulation. Here are some potential causes and solutions to consider:👽👿

Addressing Gas Layer Absence in Eulerian Two-Fluid Bed Simulations

 Several factors can influence the presence or absence of a gas layer at the bottom of buried tubes in a Eulerian two-fluid fluidized bed simulation:

Molar Mass Impact in Multicomponent CFX Simulations (Without Reactions)

 In multicomponent flow simulations without reactions, the exact value of the molar mass for each component doesn't significantly affect the mass fraction results in ANSYS CFX. Here's why:

ANSYS Fluent: Plotting Pressure Change and Determining Pressure Drop in Pipes

 Here's how to address your questions about plotting pressure change and determining pressure drop in ANSYS Fluent:

Plotting Pressure Change:

 * Surface Reports: Utilize Surface Reports in ANSYS Fluent to obtain average pressure values at the inlet and outlet faces.

ANSYS SLM Simulation: Troubleshooting Iso-Surface Movement

Iso-surface movement during SLM simulation in ANSYS can be caused by several factors. Here are some potential causes and solutions to consider:

👽

 * Inaccurate Melt Pool Dynamics: The melting behavior of the powder might be misrepresented in your simulation. Calibrate your material properties, laser power settings, and melt pool viscosity to better reflect reality.

 * Meshing Issues: A coarse mesh might not capture the melt pool dynamics accurately. Refine your mesh, particularly around the laser-powder interaction zone, to improve precision.

Ansys Cfd Post: Troubleshooting Vorticity Contours

There are two possible reasons why you might not be able to see the vorticity contours in ANSYS CFD-Post:

Water Velocity Increase in Partially Filled Stirred Vessel Simulation (OpenFOAM)

 The unexpected velocity increase in your partially filled stirred vessel simulation could stem from a few factors:

Hey everyone,

I have a weird problem with my simulation of a stirred vessel partially filled with water. Above the air-water interface, the velocity of water (UWater) gradually increases over time and I can't figure out why. I think this increase over time causes my simulation to fail after simulating a few seconds

I mostly used the case from this link as a reference: https://www.cemf.ir/simulating-two-p...sing-openfoam/

I can't figure out what the problem is for the increase. Does anyone know what could be the cause for this or had similar issues in the past?

Porting Initial Field from StarCCM+ to OpenFOAM for Continuing Simulations

 There are two main approaches to porting the initial field from a StarCCM+ simulation to an OpenFOAM case:

 * Using ccmToFoam: While ccmToFoam can convert the mesh, it may not directly translate the initial field data. You'll need to manipulate the converted data to match OpenFOAM's format.

Simulating Rough Wall Pipe Flow in OpenFOAM with interFoam

 In OpenFOAM, you can simulate rough wall effects in your pipe flow simulations using the roughWall function object. This function alters the logarithmic law of the wall to account for the increased drag caused by the roughness.

Swift JSONDecoder: Access Nested JSON String without Decoding Entire Object

 To access the raw GeoJSON string within a nested part of your server response without decoding the entire structure, you can use the decodeIfPresent(_:forKey:) method of the Decoder object. Here's how you can modify your code:

Fixing "command not found" errors during OpenFOAM 11 installation on WSL

 I am trying to install the OpenFOAM 11 version of thew software on my Windows server 22 OS through WSL. I followed the documentation based on the 4 steps mentioned here.

https://openfoam.org/download/source...g-environment/

While sourcing the bashrc file through my $HOME directory, I am getting the following errors as shown in the image attached. Do I need to make any changes in the User editable portion of the bashrc script?

OpenFOAM 11 'mover' Interpolator Option: Usage and Alternatives

To help with the 'mover' in OpenFOAM 11, specifically the 'interpolator' option.

While there seems to be a lack of readily available examples or tutorials on the 'interpolator' option in OpenFOAM 11's 'mover' dictionary, here's some insight that might be helpful:

Resolve "Try signing in with a different account" Error During Google Sign-in with NextAuth.js

 The error message "Try signing in with a different account" usually indicates an issue with the Google account being used for login. Here are some troubleshooting steps you can try:

C# - Find Error Code in Excel Table using ClosedXML

 ClosedXML is a good choice for working with Excel files in C#. Here's a refined approach to achieve your goal:

 * Read Error Code: Prompt the user to enter the error code using textBox1.Text.

ASP.NET EXE Output Text ??? - Encoding, Fonts, Permissions & Environment Variables

 The issue you're facing with the text appearing as ??? in the generated JPG file when executing the EXE from your ASP.NET application could be due to several reasons:

 * Encoding Mismatch: The encoding used by your ASP.NET application might differ from the encoding expected by the external EXE. Try specifying the encoding for the command line arguments using Encoding.UTF8.GetBytes().

Resolving Backflow in buoyantPimpleMhdFoam Simulation with OpenFOAM

 Backflow in OpenFOAM simulations can arise from various factors, even when using the inletOutlet boundary condition. Here are some potential causes and solutions for your specific scenario:

Resolving Unit Inconsistencies in Non-Newtonian Viscosity Calculations (Herschel-Bulkley Model)

There is  the inconsistency in units for non-Newtonian viscosity calculations in the Herschel-Bulkley model. The inconsistency arises because the model expresses shear stress (tau) in units of N/m^2 (Pascals), while the shear rate (gamma_dot) is in units of s^-1 (reciprocal seconds).

2D Homogeneous Isotropic Turbulence (HIT) Simulation in Ansys Fluent: A Beginner's Guide

 Setting up a simulation for 2D homogeneous isotropic turbulence (HIT) in Ansys Fluent requires defining a specific flow condition. While Fluent itself may not have a pre-configured template for HIT, you can achieve this by following these steps:

Ansys Electronics Desktop Mesh Quality Error: Solution and Troubleshooting

 The error message you're encountering in Ansys Electronics Desktop

The quality of some mesh elements is not acceptable for solution. Please check the geometry for issues in the following location.. 

 indicates that the mesh quality in a specific location (X=0.00536424, Y=-0.0146285, Z=-0.0061444) is below the acceptable threshold for accurate simulation results. Here are some steps you can take to address this issue:

OpenFOAM Error: Carrier Phase curlUc Interpolation Object Not Set (SaffmanMeiLiftForce)

 The error message "Carrier phase curlUc interpolation object not set" in OpenFOAM indicates that a required interpolation object for the Saffman Mei lift force calculation is missing. Here's how to address this:

Fitting Rheology Data to PTT or Maxwell Models for OpenFOAM Simulations

 Converting rheology data to model parameters is definitely possible! Here's a general approach for fitting your complex rheology data (G*, G', and G'') to the PTT or Maxwell models using OpenFOAM:

Exporting Airfoil from DesignFOIL to AirfoilTools for Impeller Design

 DesignFOIL allows exporting airfoil coordinates in various formats, including DAT files. However, AirfoilTools specifically requires a DAT file format with a header containing specific information about the airfoil.

How to model melting phase PCM in Ansys Fluent

 Here are some suggestions for your simulation of melting a phase change material (PCM) in an open cup:

Boundary Condition at Top (1):

How to deal with small gap problem when extract model in Ansys

 The small gap you're encountering when extracting the internal volume in your pressure tank model with tubes is likely due to slight geometric imperfections or tolerances between the separate parts in your CAD software. Here are a few approaches you can try to fix this:

Can I Use Transition SST turbulence model for turbine or rotor in Ansys Fluent ?

 Yes, you can likely use the Transition SST model for your Darrieus turbine simulation in ANSYS FLUENT given the y+ wall value of approximately 1. Here's why:

Dynamic library error in OpenFoam. How to solve ?

 I'd be glad to help you with the dynamic library error you're encountering in your OpenFOAM simulation. While I cannot provide specific instructions on copying and pasting due to the potential variations in file structures and operating systems, here are general guidelines that should help you resolve the issue:

Abaqus is unable to locate a C++ compiler

 The error message indicates that Abaqus is unable to locate a compatible C++ compiler on your system. Here are some potential solutions that you can try:

 * Load vcvars64.bat: As suggested in the message, try loading the vcvars64.bat file before running Abaqus. This batch file sets up the environment variables for the Visual Studio C++ compiler. You can typically find it in the following location:

   C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvars64.bat

The error message "Not enough constraints applied to prevent rigid body motion" in Ansys

 The error message "Not enough constraints applied to prevent rigid body motion" in Ansys Mechanical indicates that your PMSM rotor model is missing essential constraints to prevent it from undergoing unrealistic movements during the simulation. Here are some troubleshooting steps to address this:

Why I cannot apply a constant speed in the Harmonic Response? (Like the "rotational velocity" in the static structural analysis)

 In harmonic response analysis, applying a constant speed like in static structural analysis isn't possible because harmonic analysis focuses on the response of a system to varying excitation forces over a range of frequencies.

How to use timeVaryingMappedFixedValue in OpenFoam?

 The timeVaryingMappedFixedValue boundary condition in OpenFOAM allows you to prescribe values that vary in time and space on a patch. Here's a breakdown of its usage with the interFoam solver:

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:

Colour variable'Velocity Meridional' does not exist - in ansys cfx how to fix it ?

 The error message "Colour variable 'Velocity Meridional' does not exist" in ANSYS CFX indicates that the report template you're using is trying to reference a variable that doesn't exist in your simulation data. Here are a few ways to fix this issue:

1. Verify Variable Name:

• Double-check the spelling of "Velocity Meridional" in the report template. Ensure it matches the exact name of the variable in your simulation data.
• In CFX, meridional velocity typically refers to the velocity component in the circumferential direction. Look for variables named "Circumferential Velocity" or "Theta Velocity" in the list of available solution variables.

The Influence of Prandtl Number on Shear Stress and Heat Transfer in Compressible Boundary Layers

 You're right, in compressible boundary layers, increasing the Prandtl number (Pr) generally leads to a decrease in shear stress (skin friction) and Stanton number. Here's why:

Prandtl Number (Pr):

Pr is the ratio of momentum diffusivity (ν) to thermal diffusivity (α). It represents the relative ease with which momentum and heat diffuse within a fluid.

• Low Pr: When Pr is low (typical for gases), momentum diffuses more readily than heat. This means velocity gradients (shear) are higher near the wall, resulting in higher skin friction.
• High Pr: As Pr increases (typical for liquids), thermal diffusivity becomes more dominant. Heat diffuses faster, reducing the temperature gradients near the wall. This, in turn, affects the viscosity (which is temperature-dependent) and reduces the shear stress at the wall.

What free open source programs similar to Ansys can you find today

 Ansys is a powerful commercial software suite, so there isn't a single free program that offers all its functionalities. However, depending on your specific needs, here are some free and open-source options that can handle various aspects of structural analysis similar to Ansys:

General Structural Analysis:

• CalculiX: This open-source project provides a complete FEA (Finite Element Analysis) solution with pre/post-processing capabilities and a built-in solver. It's a good option for general linear structural analysis. (https://www.dhondt.de/)
• Elmer/ElmerGrid: Elmer is an open-source multiphysics solver with modules for structural mechanics. ElmerGrid is a separate mesh generator often used with Elmer. This combination allows for complex simulations, but requires more technical expertise. ([invalid URL removed])
• Salome with Code_Aster: Salome is an open-source pre/post-processing platform compatible with various solvers, including Code_Aster, which focuses on structural analysis. This option offers good flexibility but might require learning multiple tools. (https://old.salome-platform.org/)

Ansys Discovery vs. Ansys SpaceClaim: Pros and Cons

 Both Ansys Discovery and Ansys SpaceClaim are Ansys software products, but they serve different purposes. Here's a breakdown of their pros and cons to help you decide which one is better for your needs:

Water: A fascinating substance without which we cannot imagine life! 12 FACTS :)

Do you know that...👀

* **We are aquatic beings?** Our bodies consist of 60-70% water, and our brains even 75%! Without water, we couldn't digest, transport nutrients, or regulate body temperature - we would simply cease to exist!

* **There is more water on Earth than you think!** If we distributed it all evenly, it would create an ocean 3,700 meters deep! Unfortunately, only 2.5% is fresh water, the rest is salt water.

* **Water is a magical solvent!** It can dissolve more substances than any other liquid on Earth - that's why it mixes so easily with juices, tea and... soup!

* **Water can change states of matter!** When heated, it turns into steam and when cooled, it turns into ice. This is why we have clouds, rain, snow and glaciers - amazing phenomena that shape our planet!

* **Water is essential for life, not only for humans!** Plants, animals - all living beings need it to function properly. Without it, the world would be a desert ball!

Water is more than just a liquid. It is a **life-giving elixir**, a **powerful force of nature** and an **extraordinary substance**. Let's take care of it, save and appreciate its unique properties!

When to use sliding mesh and when to use mrf method in Ansys Fluent

Choosing between a Sliding Mesh and MRF (Multiple Reference Frame) in ANSYS Fluent depends on the complexity of your simulation and the accuracy you require.

Why choosing implicit method in VoF eulerian model is the best option ?

 Imagine you're a detective trying to track down a mischievous gas bubble hiding in a swirling liquid. In the world of computational fluid dynamics (CFD), that bubble is your friend, and you're the CFD model trying to predict its movement.

There are two main ways to approach this case: explicit and implicit methods.

How to start learning fluid mechanics in numerical analyses?

 Fluid mechanics with numerical analysis, also known as Computational Fluid Dynamics (CFD), is a powerful field! Here's a roadmap to get you started:

How to model crack propagation in Ansys ?

 Ansys offers functionalities to model crack propagation through the Ansys Mechanical software and the SMART Crack Growth feature. Here's a general breakdown of the process:

1. Pre-Processing:

• Geometry and Mesh: Define the geometry of your model in Ansys Workbench. Ansys Mechanical's Unstructured Mesh Method (UMM) can automatically generate a mesh suitable for crack simulations, reducing preprocessing time [Ansys white paper on SMART Crack Growth & Fracture Modeling].
• Material Properties: Assign material properties to your model, including the fracture toughness which plays a critical role in crack growth behavior.