S2S Radiation Heat Transfer, CFD Simulation ANSYS Fluent Training

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The present simulation is about S2S radiation heat transfer via ANSYS Fluent.

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S2S Radiation Heat Transfer Description

The present simulation is about S2S radiation heat transfer via ANSYS Fluent. In this project, plates model the three boxes, and inside these boxes, a tube is designed. The fluid flow inside the tube moves at a temperature of 283 K and a velocity of 20 m/s, and there is airflow inside the boxes around the tube.

It is assumed that these metal plates have a heat source of 1133333.33 W/m3. It is also assumed that radiation heat transfer occurs between the box plates and the surface of the tube. Therefore, the software has used the surface-to-surface (S2S) radiation model.

The surface-to-surface radiation model calculates the radiation exchange in an enclosure of gray-diffuse surfaces. The exchange between the two surfaces depends partly on their size, separation distance, and orientation. These parameters are calculated by a geometric function called a “view factor”. The main assumption of the S2S model is that any absorption, emission, or scattering of radiation can be ignored; Hence, only surface-to-surface radiation is considered for analysis.

The S2S model assumes that the pages should be gray and diffuse. The emissivity and absorptivity of a gray surface are independent of the wavelength, and according to Kirchhoff’s law, the emissivity is equal to the absorptivity (ε = α). Also, the reflectivity is independent of the outgoing (or incoming) directions for a diffuse surface.

Geometry & Mesh

The present geometry is designed in a 3D model via Design Modeler The computational zone is related to the interior of three boxes created by several plates. An output boundary is considered between each of the boxes. A pipe is also passed through the interior of these boxes.


The mesh of the present model has been done via ANSYS Meshing. Mesh is structured, and the number of production cells is equal to 2101788.


Set-up & Solution

Assumptions used in this simulation:

  • Pressure-based solver is used.
  • The present simulation is steady.
  • The effect of gravity on the model is ignored.


Viscous k-epsilon
k-epsilon model standard
near wall treatment standard wall function
Radiation Surface to Surface (S2S)
Boundary conditions
Inlet-tube Velocity Inlet
velocity magnitude 20 m.s-1
temperature 283 K
internal emissivity 1
Outlet-tube & Outlet-plates Pressure Outlet
gauge pressure 0 Pascal
internal emissivity 1
Inner & Outer Plates’ Wall Wall
thermal condition coupled
Tube’s Wall Wall
heat flux 0 W.m-2
Pressure-Velocity Coupling Coupled
pressure Second-order
momentum Second-order upwind
turbulent kinetic energy First-order upwind
turbulent dissipation rate First-order upwind
energy Second-order upwind
Initialization methods Hybrid

S2S Radiation Heat Transfer Results

After calculation, 2D and 3D contours related to temperature, temperature gradient, velocity, pressure, and density are obtained. The contours show that the heat generated by the plates is transferred through radiation between the surfaces in the space around the pipe. This radiation heat transfer between the surfaces leads to an increase in the air temperature of the tube.


  1. Avatar Of Natasha Mcclure Iii

    Natasha McClure III

    I’ve always been curious about how radiation heat transfer complexities are managed in simulations. Your detailed explanation cleared it up for me and the results are fascinating. Thanks for demonstrating the S2S model effectively in a dynamic setup.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your positive feedback! We’re thrilled to hear that our S2S radiation heat transfer simulation was able to elucidate the complexities of radiation heat transfer for you, and that you found the demonstration and results engaging. If you have any more questions about the simulations or any further interests, feel free to reach out to us.

  2. Avatar Of Kamille Kerluke

    Kamille Kerluke

    The S2S Radiation Heat Transfer simulation project you shared actually sparked my interest in the interplay between radiation transfer and airflow around the structures. Your explanation of the view factor and the assumption of the pages being gray and diffuse is particularly helpful in understanding the underlying theory. It seems like an ideal setup for learning about radiation heat transfer in enclosed structures.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you! We’re delighted to hear that the project on S2S radiation heat transfer met your educational needs and piqued your interest. Understanding the concept of the view factor and the assumptions used in the S2S model is crucial for grasping the simulation’s intricacies fully. We appreciate your recognition of the project’s helpfulness and if you have any further questions or require additional learning materials, please feel free to reach out to us.

  3. Avatar Of Julius Parisian

    Julius Parisian

    Was it mentioned in the simulation if natural convection was considered in addition to the S2S radiation for heat transfer calculations?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Yes, the description of the setup mentions air inside the boxes around the tube, suggesting that natural convection could contribute to the heat transfer. However, no explicit mention of considering natural convection in the calculations is made, so the simulation mainly focuses on S2S radiation heat transfer.

  4. Avatar Of Sidney Schmitt

    Sidney Schmitt

    I’ve noticed an incredible uniformity in the temperature distribution in the provided simulation results. Could you explain how the S2S model ensures this level of consistency despite the complex interactions between radiating surfaces?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      The S2S (Surface-to-Surface) radiation model is designed to calculate radiation exchange between gray-diffuse surfaces within an enclosure very effectively. The accuracy of the simulation is due to the careful calculation of view factors—geometric functions that account for surface size, separation distance, and orientation, which influence how heat is radiated between surfaces. In addition, by assuming that the surfaces are gray and diffuse (consistent emissivity and reflectivity), the S2S model simplifies the complex interactions to a more predictable and stable state, promoting uniform heat transfer and hence, a more uniform temperature distribution.

  5. Avatar Of Tiara Becker

    Tiara Becker

    I’m impressed with the level of detail of this S2S radiation heat transfer simulation and the comprehensive training provided!

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your kind words! We’re delighted to hear that you’re satisfied with the quality of the simulation and the training. It’s our pleasure to provide detailed and useful educational materials to help our customers understand complex phenomena. Don’t hesitate to reach out to us if you need any further assistance or information.

  6. Avatar Of Guido Farrell

    Guido Farrell

    The clear explanation of the S2S model helped me understand the surface radiation heat transfer used in my own projects. The detailed results enabled me to improve the heat management in designs. Excellent training material.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your positive feedback! We are thrilled to hear that our detailed S2S radiation heat transfer simulation was helpful in enhancing the heat management in your designs. Your success inspires us to continue providing high-quality training materials.

  7. Avatar Of Everardo Stark

    Everardo Stark

    I was impressed by how detailed the simulation is when handling radiation heat transfer! It’s quite clear how the S2S model is applied and it seems like a comprehensive approach to handling such a scenario.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your feedback! We are glad to hear that the details and application of the S2S radiation model in the simulation met your expectations. Our goal is to provide comprehensive and accurate simulations to help users understand complex physical phenomena. We appreciate your recognition of our efforts!

  8. Avatar Of Emanuel Keebler

    Emanuel Keebler

    This course has helped me grasp the complexities of S2S radiation heat transfer in Ansys Fluent. The clear description and detailed setup instructions made this complex concept easy to understand.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your kind words! We’re delighted to hear that our training has demystified S2S radiation heat transfer for you in ANSYS Fluent. Should you have any further learning needs, please don’t hesitate to reach out.

  9. Avatar Of Ms. Shayna Grant Iv

    Ms. Shayna Grant IV

    Everything about the way the heat transfer is simulated with S2S method was clear, but I’m curious if with the provided settings, the distribution of temperature around the corners of the boxes seemed realistic?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your positive feedback. To address your question, yes, with the settings provided in this simulation, the temperature distribution around the corners should be evaluated realistically. The S2S radiation model considers the geometric factors such as size, separation distance, and orientation to calculate the radiation exchange accurately, including the effects at the corners. The results, which include temperature contours, help to visualize these distributions. If further detailed inspection is needed, adjustments to the mesh or simulation parameters could be made for enhanced precision.

  10. Avatar Of Dr. Gregoria Huel Iv

    Dr. Gregoria Huel IV

    The S2S Radiation Heat Transfer course was meticulous and very helpful. The view factor explanations were particularly insightful; breaking it down made understanding the S2S model much easier. Thank you for this excellent CFD training!

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your positive feedback! We’re delighted to hear that our S2S Radiation Heat Transfer simulation training was helpful and that the explanations on the view factor were clear and insightful. Your satisfaction is our top priority! If you have any more questions or need further assistance in the future, don’t hesitate to reach out.

  11. Avatar Of Dr. Idella Bechtelar

    Dr. Idella Bechtelar

    The simulation handles the heat source and S2S radiation very well. The insights from the temperature contours demonstrate the importance of considering radiation heat transfer in the thermal analysis.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for the positive feedback! We are thrilled to hear that the simulation met your expectations and provided valuable insights into S2S radiation heat transfer. Should you need more information or assistance with your thermal analysis projects, feel free to reach out to us.

  12. Avatar Of Miss Stacy Jerde Phd

    Miss Stacy Jerde PhD

    Are the plates and the tube considered of the same material, or do they have different thermal properties in the S2S radiation heat transfer simulation?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      In the S2S radiation heat transfer simulation conducted via ANSYS Fluent, the plates and the tube could have distinct thermal properties. This typically includes differences in emissivity, material density, specific heat capacity, and thermal conductivity, key factors that impact the rate and efficiency of heat transfer. However, to precisely answer this, further information regarding the materials used for the plates and the tube in the specific simulation is required.

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