FluidXAV

New FREE Online CFD Course Coming Soon on FluidXAV!

Electronics Cooling CFD Simulation in ANSYS Fluent

Learn the complete CFD workflow for electronics cooling analysis step-by-step using ANSYS SpaceClaim, DesignModeler, ANSYS Meshing, and Fluent.

Course Release Schedule:

08 July
Introduction to Electronics Cooling CFD Simulation | Ansys Fluent Course
https://youtu.be/riculUC5nTU


15 July
PART 01 — Geometry Creation in SpaceClaim
https://youtu.be/B4zX9gOOL-I


22 July
PART 02 — Fluid Volume Extraction in DesignModeler
https://youtu.be/xNWZinjApKY


29 July
PART 03 — Meshing in ANSYS Meshing
https://youtu.be/Vx3lKBRMHFI


5 August
PART 04 — Fluent Setup and Solution
https://youtu.be/jJ8yQJx3Ya8


12 August
PART 05 — Post-Processing and Results Analysis
https://youtu.be/NlyzcwarWMA


In this course, you will learn:
• Electronics enclosure modeling
• Cooling fan airflow simulation
• Heat transfer analysis
• CFD meshing techniques
• Fluent solver setup
• Thermal post-processing and visualization

Subscribe now and don’t miss the upcoming tutorials on FluidXAV!

#CFD #ANSYSFluent #ElectronicsCooling #ThermalSimulation #ANSYS #Fluent #SpaceClaim

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1 day ago | [YT] | 2

FluidXAV

Want to level up your simulation skills? Explore Ansys Foundational Fridays Webinar Series


Getting Started with Ansys Fluent for Biomedical Engineering

🔗www.ansys.com/webinars/getting-started-with-ansys-…





These free, beginner‑friendly webinars are designed for students who want to turn engineering theory into real‑world simulation skills.



✔️ Core concepts
✔️ Hands‑on workflows
✔️ Industry‑leading Ansys, part of Synopsys Inc, tools



Perfect for students, projects, and student teams.

#LearnAnsys #EngineeringStudents #Simulation #STEM #FutureEngineers #fluidxav


Date/Time:
June 12, 2026
9 AM EDT



Venue:
Virtual

1 month ago (edited) | [YT] | 4

FluidXAV

How to Check Y+ in ANSYS Fluent:


Fluent calculates Y+ automatically after at least one iteration.






🔷 For 3D simulations

Go to:
Display → Contours
Under Contours of, choose:
Turbulence → Y Plus
Select the wall surfaces you want to inspect.
Turn off the option:
✅ Node Values
(This ensures the values displayed are based on cells, not nodes.)
Click Display.




Now you can view the minimum and maximum Y+ on your geometry.







🔷 For 2D simulations

Go to:
Display → Contours
Under Contours of:
Turbulence → Y Plus
No need to select surfaces — Fluent automatically shows Y+ next to walls.
Turn off Node Values.
Click Display.







✅ Important:
Only look at cells touching the wall.
Y+ values elsewhere are not physically meaningful.

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1 2 3 4

1 month ago | [YT] | 3

FluidXAV

🚀 FREE CFD Course – Marin 3D Dam Break Simulation (VOF | Ansys Fluent)

I’m excited to share my new step-by-step CFD tutorial series, where we simulate a 3D dam break problem using Ansys Fluent (VOF multiphase model).

📂 Full Playlist:
Marin 3D Dam Break CFD Tutorial | Ansys Fluent Step-by-Step (VOF, Meshing, Simulation & Postprocessing)
www.youtube.com/playlist?list...

📅 Course Release Schedule (Weekly at 16:00):

🔹 April 28, 2026 – Course Overview
Multiphase CFD Tutorial | VOF Dam Break Simulation in ANSYS Fluent (FREE Course Overview)

🔹 May 5, 2026 – Geometry Creation in SpaceClaim
https://youtu.be/XF-q9cBPIHs

🔹 May 12, 2026 – Grid Generation in Fluent Meshing
https://youtu.be/gXF-T7sd0r0

🔹 May 19, 2026 – Simulation Setup in Ansys Fluent (VOF)
https://youtu.be/k5-11J9XcyY

🔹 May 26, 2026 – Run & Postprocessing (Results & Animation)
https://youtu.be/L8dSzbmC20s

💡 What you’ll learn:
✔ Geometry creation in SpaceClaim
✔ Advanced meshing (PolyHex + inflation layers)
✔ VOF multiphase modeling (water–air interaction)
✔ Transient CFD simulation setup
✔ Postprocessing, visualization & animation

🎯 By the end, you’ll be able to perform a complete 3D dam break simulation from scratch.

🔔 Subscribe and turn on notifications to follow the full series step-by-step!

#CFD #AnsysFluent #FluidDynamics #Engineering #Simulation #VOF #MultiphaseFlow #CFDTutorial #FreeCourse

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1 month ago | [YT] | 1

FluidXAV

Types of Fluid Flow Classification

In fluid mechanics, we classify flows to better understand and model them. Here’s a simple guide with practical examples:

1. Steady vs. Unsteady Flow
Steady flow: Properties do not change with time.
Example: Water flowing at a constant rate in a pipe.
Unsteady flow: Properties change with time.
Example: Flow during pump start-up.

2. One-, Two-, and Three-Dimensional Flow
1D flow: Changes in one direction.
Example: Flow in a long straight pipe.
2D flow: Changes in two directions.
Example: Flow over a wide flat plate.
3D flow: Changes in all directions.
Example: Flow around a car.

3. Laminar, Transitional, and Turbulent Flow
Laminar: Smooth layers.
Example: Slow oil flow in a small tube.
Transitional: Between laminar and turbulent.
Example: Flow at medium velocity in a pipe.
Turbulent: Chaotic mixing.
Example: Fast river flow or airflow around a plane.

4. Uniform vs. Non-Uniform Flow
Uniform flow: Same properties along the path.
Example: Flow in a long straight channel with constant cross-section.
Non-uniform flow: Properties change along the path.
Example: Flow in a converging nozzle.

5. Free Shear vs. Wall-Bounded Flow
Free shear flow: No wall contact.
Example: Water jet from a nozzle.
Wall-bounded flow: In contact with walls.
Example: Flow inside a pipe.

6. Compressible vs. Incompressible Flow
Compressible: Density changes.
Example: High-speed air in a jet engine.
Incompressible: Density constant.
Example: Water flow in pipelines.

7. Rotational vs. Irrotational Flow
Rotational: Fluid particles rotate.
Example: Flow near a rotating impeller.
Irrotational: No rotation.
Example: Ideal flow far from solid boundaries.

8. Viscous vs. Inviscid Flow
Viscous: Friction effects are important.
Example: Honey flowing slowly.
Inviscid: Negligible viscosity.
Example: Idealized airflow in theory.

9. Internal vs. External Flow
Internal flow: Confined flow.
Example: Flow in pipes or ducts.
External flow: Flow over objects.
Example: Airflow over an airplane wing.

10. Subsonic, Sonic, Transonic, Supersonic Flow
Subsonic: Speed less than sound.
Example: Airflow around a car.
Sonic: Speed equals sound.
Example: Flow at nozzle throat.
Transonic: Around the speed of sound.
Example: Commercial aircraft cruise conditions.
Supersonic: Speed greater than sound.
Example: Flow around supersonic jets.

11. Newtonian vs. Non-Newtonian Flow
Newtonian: Constant viscosity.
Example: Water, air.
Non-Newtonian: Variable viscosity.
Example: Blood, ketchup.

12. Developing vs. Fully Developed Flow
Developing flow: Velocity profile changing.
Example: Entrance region of a pipe.
Fully developed flow: Profile stable.
Example: Flow far downstream in a pipe.

💡 Understanding these categories helps you choose the right assumptions and models in CFD simulations.

#FluidMechanics #CFD #Engineering #FluidFlow #FluidXAV

2 months ago | [YT] | 2

FluidXAV

#CFD #Interview Question (Interpreted vs Compiled UDF in ANSYS Fluent) – Post 10

Q: What is the difference between interpreted and compiled UDFs in ANSYS Fluent?

A:

In ANSYS Fluent, UDFs (User-Defined Functions) can be used either as interpreted or compiled, depending on complexity and performance needs.


🔹 Interpreted UDF

Read and executed directly by Fluent

No external compiler required

Easy to set up and quick to test

Best suited for simple logic, boundary conditions, or source terms

⚠️ Limitation: slower execution and limited access to advanced C features.

Use case: Time-dependent heat flux at a wall
👉 Simple logic, quick testing, no compiler needed

#include "udf.h"

DEFINE_PROFILE(time_dependent_heat_flux, t, i)
{
real time = CURRENT_TIME;
face_t f;

begin_f_loop(f, t)
{
/* Heat flux varies sinusoidally with time */
F_PROFILE(f, t, i) = 1000.0 + 500.0 * sin(2.0 * M_PI * time);
}
end_f_loop(f, t)
}

🔍 Why this is a good interpreted UDF example

Easy to read and modify

Ideal for boundary conditions

Executed directly by Fluent

Commonly used during model setup and testing

🧠 Interview explanation:

“This UDF is simple and called only at boundaries, so interpreted mode is sufficient and convenient.”



🔹 Compiled UDF

Compiled into a shared library using a C compiler

Faster execution and more robust

Supports complex calculations, loops, and memory usage

Preferred for large simulations or time-dependent models


👉 Practically, I use interpreted UDFs for quick testing and prototyping, and compiled UDFs for final, production-level simulations.


🔹 Follow-up Interview Question:
When would you avoid using an interpreted UDF?

A:
I avoid interpreted UDFs when:

The model is computationally heavy

The UDF is called frequently (e.g., every iteration or time step)

Parallel performance and stability are important

In such cases, a compiled UDF is more efficient and reliable.

Use case: Temperature-dependent material property
👉 Called many times, performance-critical

#include "udf.h"

DEFINE_PROPERTY(temperature_dependent_viscosity, c, t)
{
real T = C_T(c, t); /* Cell temperature */
real mu;

/* Example: exponential viscosity model */
mu = 1.0e-3 * exp(-0.01 * (T - 300.0));

return mu;
}

🔍 Why this should be compiled

Called for every cell, every iteration

Computationally expensive

Benefits strongly from compilation

Better performance in large or transient simulations

🧠 Interview explanation:

“Since this UDF is evaluated frequently inside the solver loop, I compile it to improve speed and stability.”


🧠 Key Interview Insight:

Interpreted UDFs are for convenience. Compiled UDFs are for performance.

💬 Are you ready for a CFD interview?
Can you confidently explain when to use interpreted vs compiled UDFs? 👇

🔗 Check all CFD interview posts on FluidXAV:
👉 youtube.com/@FluidXAV/posts

Why interviewers like this question

✅ Tests Fluent experience, not theory
✅ Shows engineering judgment
✅ Separates users from CFD engineers

4 months ago | [YT] | 4

FluidXAV

Mass Flow-Weighted vs Area-Weighted Averaging in ANSYS Fluent (CFD Tip)

Choosing the wrong averaging method in CFD post-processing can silently give you misleading results.

Here’s a simple and practical rule used by experienced Fluent & CFX users:

🔹 Area-Weighted Averaging → for Static Quantities

Use area-weighted averaging when the variable is mainly related to geometry:

✔ Static pressure
✔ Static temperature
✔ Wall quantities (walls have zero mass flow)

➡ Best for walls, cross-sections, and surfaces where flow does NOT pass through

🔹 Mass Flow-Weighted Averaging → for Total / Flow-Driven Quantities

Use mass flow-weighted averaging when the variable includes velocity / dynamic effects:

✔ Total pressure
✔ Total temperature
✔ Any quantity transported by mass flow

➡ Only meaningful on inlets, outlets, or flow-through surfaces

📌 Practical CFD Example

Imagine an outlet with non-uniform velocity:

• A large low-velocity region
• A small high-velocity jet

➡ Area-averaged total pressure gives equal importance to both
➡ Mass-flow-weighted total pressure correctly emphasizes the jet (real physics!)

This is why turbomachinery, ducts, nozzles, and pipe flows almost always use mass-weighted averages at inlets/outlets.

⚠ Common Mistakes to Avoid

❌ Using mass-weighted averaging on walls
❌ Using area-averaged total pressure at outlets
❌ Comparing results using different averaging methods

Always state the averaging method in your CFD reports.

✅ Quick Rule of Thumb

Static → Area-Weighted
Total / Convected → Mass-Weighted

📊 Small detail. Big impact.
Correct averaging = correct engineering decision.

#ANSYSFluent #CFD #PostProcessing #CFDTips #Engineering #Fluent #CFX #FluidDynamics

4 months ago | [YT] | 3

FluidXAV

CFD interview coming up? Test yourself with this question.

#CFD #Interview Question (Boundary / Inflation / Prism Layers) – Post 9

Q: Why do we use boundary layers (inflation/prism layers) in CFD simulations?

A:
In CFD, flow variables are stored at cell centroids and vary linearly between cells.
Near walls, velocity and temperature gradients are very steep due to the no-slip condition and boundary layer physics.

👉 A purely unstructured mesh cannot resolve these near-wall gradients accurately.

Boundary layers, implemented numerically as inflation layers or prism layers, are thin cells grown normal to the wall. They allow the solver to:

Resolve near-wall velocity and temperature profiles

Accurately compute wall shear stress

Predict heat transfer coefficients reliably

⚙️ In ANSYS Fluent, boundary/inflation/prism layers are especially critical for RANS turbulence models, where near-wall treatment directly affects accuracy.

Follow-up Question:
What happens if boundary (inflation/prism) layers are not properly designed?

A:
Poor near-wall mesh design can result in:

Incorrect wall shear stress

Large heat transfer errors

Convergence issues due to large cell size jumps


✅ To avoid this, I ensure:

The physical boundary layer thickness is fully captured

A reasonable growth rate (typically 1.05–1.3)

A sufficient number of layers based on the target y⁺ value


🧠 Boundary layer is the physics. Inflation or prism layers are the numerical tools used to capture that physics.


🔗 Check all CFD interview posts on FluidXAV:
👉 youtube.com/@FluidXAV/posts

4 months ago | [YT] | 8

FluidXAV

Welcoming 2026 with Flow, Physics, and Innovation 🚀

As we step into 2026, I want to thank everyone who has been part of the FluidXAV / XAV Group journey — learners, engineers, researchers, and CFD enthusiasts from around the world.

This year, we continue exploring:
🔹 Computational Fluid Dynamics (CFD)
🔹 Ansys Fluent & Fluent Meshing
🔹 External & internal flows
🔹 Practical simulations with real engineering insight

May 2026 bring:
✔️ Converged solutions
✔️ Cleaner meshes
✔️ Stable residuals
✔️ And meaningful engineering impact

📺 YouTube – FluidXAV
youtube.com/@FluidXAV

🔗 LinkedIn – XAV Group
www.linkedin.com/company/xav/?viewAsMember=true

Let’s keep learning, simulating, and pushing CFD boundaries together.

Flowing into 2026. Let the flow continue. 🌊
Happy New Year 2026! 🎆

#FluidXAV #XAVGroup #CFD #AnsysFluent #Engineering #Simulation #NewYear2026

4 months ago | [YT] | 4

FluidXAV

🚀 New CFD Course Launching Soon on FluidXAV! 🚀

I’m excited to announce a new step-by-step CFD course on the FluidXAV channel:

📘 Transient Compressible Flow Course

SpaceClaim • Fluent Meshing • ANSYS Fluent

youtube.com/playlist?list=PL2...

This course demonstrates a complete real-world CFD workflow for modeling transient compressible flow through a nozzle, including geometry creation, meshing, solver setup, transient boundary conditions, shock capturing, and post-processing.

📂 Course Structure & Part Descriptions
🔹 Part 1 – Nozzle Geometry in SpaceClaim

📅 December 23, 2025

In Part 1, we start the workflow by creating the nozzle geometry from scratch in ANSYS SpaceClaim instead of importing a predefined model.

You will learn how to:
• Build a nozzle with a sinusoidal contour
• Model a 20% area reduction smoothly
• Apply symmetry to reduce computational cost
• Prepare the geometry for Fluent Meshing
• Organize and name boundary faces (inlet, outlet, wall, symmetry)

This part ensures full control over the geometry before moving to meshing and simulation.

🔹 Part 2 – Meshing the Nozzle in Fluent Meshing

📅 December 30, 2025

Welcome to Part 2 of the Modeling Transient Compressible Flow series on FluidXAV.

In this video, we take the nozzle geometry created in SpaceClaim and generate a high-quality mesh using ANSYS Fluent Meshing. A robust mesh is essential for accurately capturing shocks, pressure gradients, and transient flow behavior.

You will learn how to:
• Import the SpaceClaim geometry into Fluent Meshing
• Clean up topology and prepare surfaces
• Apply appropriate sizing functions and mesh controls
• Generate smooth surface meshes
• Add inflation layers for boundary-layer accuracy
• Create a poly-hexcore volume mesh for density-based solvers
• Check mesh quality and solver compatibility
• Prepare the mesh for both steady-state and transient simulations

This mesh will be used directly in Part 3 for the solver setup and transient analysis.

🔹 Part 3 – Setup, Transient Run & Post-Processing in ANSYS Fluent

📅 January 6, 2026

In the final part of the course, we move into ANSYS Fluent to set up the physics, run the solver, and analyze results for a transient compressible-flow simulation.

This video brings together the full CFD workflow using the density-based implicit solver.

🔧 What You Will Learn:

Solver & Physics Setup
• Import the poly-hexcore mesh
• Use the density-based implicit solver
• Activate the energy equation
• Define air as an ideal gas
• Set operating conditions for high-speed flow

Boundary Conditions
• Pressure inlet:
– Total pressure = 0.9 atm
– Initial static pressure = 0.7369 atm
• Pressure outlet: 0.7369 atm
• Walls: no-slip, adiabatic
• Symmetry at the center plane

Steady-State Initialization
• Run a steady-state solution
• Generate initial mass-flow, pressure, and Mach number fields

Transient Setup
• Enable second-order implicit transient formulation
• Apply a time-dependent outlet pressure using an expression:

𝑃𝑜𝑢𝑡(𝑡)=(0.12sin(2200𝑡)+0.737)×101325 Pa

• Enable automatic mesh adaption based on density gradients
• Monitor mass flow rate, pressure, and Mach number

Post-Processing
• Visualize pressure, density, and Mach number contours
• Animate transient shock motion
• Plot mass-flow rate vs. time
• Export high-quality CFD animations

✔ This part completes the full CFD workflow:

Geometry (SpaceClaim)

Meshing (Fluent Meshing)

Solver setup, transient run & post-processing (ANSYS Fluent)

🎯 Who This Course Is For
• CFD students
• Engineers working with compressible flow
• Anyone looking for a practical, real ANSYS Fluent transient tutorial

📌 Subscribe and turn on notifications so you don’t miss Part 1!

#CFD #ANSYSFluent #CompressibleFlow #TransientSimulation #FluentMeshing #SpaceClaim #ShockCapturing #DensityBasedSolver #FluidXAV #EngineeringSimulation

5 months ago | [YT] | 7