Node-dependent Surface Temperature Fluctuations

PeterAC · February 1, 2016, 15:43

Hi,

I'm having a problem with the surface temperatures on the blunt nose of a supersonic vehicle. I'm working with a wedge of an axisymmetric body, using axisymmetry boundary conditions. The surface temperatures along the axisymmetry boundary conditions exhibit and alternating node dependence (this is a node-based solver). For example, one node along the BC is very hot, the next is hot, and then the next is very hot again. And this repeats along the blunt nose. The wall is no-slip. And I am using radiative-convective equilibrium. The temperature variations are nonphysical for the problem and completely node related. Any info or recommendations would be great. Thanks!

Peter

PeterAC · February 1, 2016, 21:27

Some more info which may be pertinent:
This is an unstructured mesh.
I am using a Roe scheme

It looks like odd-even decoupling, but I've only heard of that occurring on structured grids with CDS...

Has anyone seen anything like this before, and how might I get around it?

February 1, 2016, 15:43	Node-dependent Surface Temperature Fluctuations	#1
PeterAC New Member Peter Join Date: Feb 2016 Posts: 2 Rep Power: 0	Hi, I'm having a problem with the surface temperatures on the blunt nose of a supersonic vehicle. I'm working with a wedge of an axisymmetric body, using axisymmetry boundary conditions. The surface temperatures along the axisymmetry boundary conditions exhibit and alternating node dependence (this is a node-based solver). For example, one node along the BC is very hot, the next is hot, and then the next is very hot again. And this repeats along the blunt nose. The wall is no-slip. And I am using radiative-convective equilibrium. The temperature variations are nonphysical for the problem and completely node related. Any info or recommendations would be great. Thanks! Peter

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February 1, 2016, 21:27		#2
PeterAC New Member Peter Join Date: Feb 2016 Posts: 2 Rep Power: 0	Some more info which may be pertinent: This is an unstructured mesh. I am using a Roe scheme It looks like odd-even decoupling, but I've only heard of that occurring on structured grids with CDS... Has anyone seen anything like this before, and how might I get around it?