What are the governing equations used in RADIOSS?
When performing fluid-structure coupling analysis in RADIOSS, I understand that the governing equations used are equilibrium equations for the structural part and Navier-Stokes equations with continuity equation for the fluid part. Is this understanding correct?
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Hi Yuki,
You are right about the equations that are used for both solid and fluid mechanics! Additional to these base theory equations, other theories are deployed to simulate specific behaviors, such as contacts, and make feasible their solution, mainly numerical algorithms.
In the following links you will find more information for the theory behind Radioss solid and fluid approaches. The fluid link contains information about Fluid-Structure Interaction too. You might be interested to that because of your type of analysis!
Solid Theory: https://help.altair.com/hwsolvers/rad/topics/solvers/rad/theory_basic_equations_c.htm
Fluid Theory: https://help.altair.com/hwsolvers/rad/topics/solvers/rad/theory_ale_formulation_c.htm
Other theories that Radioss use are explained in this site too: https://help.altair.com/2023.1/hwsolvers/rad/
Hi Polyvios,
Thank you for explaining the theory in RADIOSS.
However, even after examining the URL you provided, I couldn't find any descriptions related to the Navier-Stokes equations. Where can I find information about them?
Hi Polyvios,
Thank you for explaining the theory in RADIOSS.
However, even after examining the URL you provided, I couldn't find any descriptions related to the Navier-Stokes equations. Where can I find information about them?
Hi Yuki,
The Navier-Stokes equations explain the conservation of momentum. Despite this fact, is common in literature to use the Navier-Stokes term to describe the combination of mass, momentum and energy conservation equations.
In Radioss Theory link I proposed you about Fluid Theory (https://help.altair.com/hwsolvers/rad/topics/solvers/rad/theory_ale_formulation_c.htm) you can refer to the following sectors for its type of conservative law.
Conservation of Momentum:
Conservation of Mass:
Conservation of Energy:
These laws are in the heart of Navier-Stokes equations. Then in order to extract the form that you need for your application (and probably the one you have in mind searching for it) many parameters can play a crucial role. Some of these parameters are the numerical solving methodology, the reference frame you express them and the need for laminar or turbulence flow.
If you want to learn more about these equations and how they used in computational fluid dynamics (CFD) there are many classic literature references. One I propose is Computational Fluid Dynamics: The Basics with Applications by J.D. Anderson.
Polyvios
Hi Yuki,
The Navier-Stokes equations explain the conservation of momentum. Despite this fact, is common in literature to use the Navier-Stokes term to describe the combination of mass, momentum and energy conservation equations.
In Radioss Theory link I proposed you about Fluid Theory (https://help.altair.com/hwsolvers/rad/topics/solvers/rad/theory_ale_formulation_c.htm) you can refer to the following sectors for its type of conservative law.
Conservation of Momentum:
Conservation of Mass:
Conservation of Energy:
These laws are in the heart of Navier-Stokes equations. Then in order to extract the form that you need for your application (and probably the one you have in mind searching for it) many parameters can play a crucial role. Some of these parameters are the numerical solving methodology, the reference frame you express them and the need for laminar or turbulence flow.
If you want to learn more about these equations and how they used in computational fluid dynamics (CFD) there are many classic literature references. One I propose is Computational Fluid Dynamics: The Basics with Applications by J.D. Anderson.
Polyvios
Hi Polyvios,
Thanks for the advice.
Hi Yuki,
You are right about the equations that are used for both solid and fluid mechanics! Additional to these base theory equations, other theories are deployed to simulate specific behaviors, such as contacts, and make feasible their solution, mainly numerical algorithms.
In the following links you will find more information for the theory behind Radioss solid and fluid approaches. The fluid link contains information about Fluid-Structure Interaction too. You might be interested to that because of your type of analysis!
Solid Theory: https://help.altair.com/hwsolvers/rad/topics/solvers/rad/theory_basic_equations_c.htm
Fluid Theory: https://help.altair.com/hwsolvers/rad/topics/solvers/rad/theory_ale_formulation_c.htm
Other theories that Radioss use are explained in this site too: https://help.altair.com/2023.1/hwsolvers/rad/