- #1

Pooven

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Hi there, I'm fairly new to Computation Fluid Dynamics and the engineering concepts as a whole. I believe CFD is generally a Chemical and Mechanical Engineering interest but I thought I'd post in this sub forum. I'd like to share what little I know and learn from others.

I understand that the basic idea is to model the continuous domain into a discrete domain usually by using a grid or mesh. I'm particularly interesting in the 3D discretization where the mesh is made up of http://en.wikipedia.org/wiki/Hexahedral" (and perhaps other) geometries. So the first step is to define the geometries to be used.

I think, that the next step is to simplify the https://www.physicsforums.com/showthread.php?t=6148" on Wikipedia for brief overview. Wikipedia refers to these as

I also read this tutorial which suggested the conversion from a differential equation to an algebraic equation (but it was within a 1D domain): http://courses.cit.cornell.edu/fluent/cfd/intro.pdf"

There is also a http://www.cfd-online.com/Wiki/Turbulence_modeling" that helps to describe the seemingly 'random' behaviour of particles.

What I'm a bit confused about is how the equations are solved over the geometries of the mesh. Suppose I have a hexahedral celled mesh... would the equations be different from a mesh with tetrahedral cells? Is it the discretization method that adapts the equations to the chosen geometries? The equations I mention here refer to the governing mass and momentum equations for the flow.

Any suggestions or insight would be deeply appreciated.

Kind regards,

Pooven

I understand that the basic idea is to model the continuous domain into a discrete domain usually by using a grid or mesh. I'm particularly interesting in the 3D discretization where the mesh is made up of http://en.wikipedia.org/wiki/Hexahedral" (and perhaps other) geometries. So the first step is to define the geometries to be used.

I think, that the next step is to simplify the https://www.physicsforums.com/showthread.php?t=6148" on Wikipedia for brief overview. Wikipedia refers to these as

*discretization methods*.I also read this tutorial which suggested the conversion from a differential equation to an algebraic equation (but it was within a 1D domain): http://courses.cit.cornell.edu/fluent/cfd/intro.pdf"

There is also a http://www.cfd-online.com/Wiki/Turbulence_modeling" that helps to describe the seemingly 'random' behaviour of particles.

What I'm a bit confused about is how the equations are solved over the geometries of the mesh. Suppose I have a hexahedral celled mesh... would the equations be different from a mesh with tetrahedral cells? Is it the discretization method that adapts the equations to the chosen geometries? The equations I mention here refer to the governing mass and momentum equations for the flow.

Any suggestions or insight would be deeply appreciated.

Kind regards,

Pooven

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