Artificial viscosity introduction

osoucy · January 23, 2014, 11:43

Hi,

I need to simulate the flow field around multi-blunt-body configurations. I'm only interested in flow velocities on a macro level since the solution will be interpolated on a coarser grid with cell sizes of about 5% of the characteristic length of each body.

Typically, I solved the flow field using the Euler equations which provided enough accuracy for my specific needs. However, would it be possible to introduce some level of flow separation and turbulence effects without solving the full Navier-Stokes equations with a turbulence model? Is it possible to artificially locally introduces some viscous effects?

Regards,

hlk · January 28, 2014, 16:27

Hello,
One option to introduce viscosity without using a turbulence model would be to set the turbulence model to 'KIND_TURB_MODEL=NONE' and 'PHYSICAL_PROBLEM = RANS' in order to simulate viscous, laminar flow, but since you specifically mention turbulence and separation that may not be what you are looking for.

An alternative that would avoid the RANS simulation, which unfortunately as far as I know has not been implemented with SU2, is to use a coupled Euler boundary-layer approach.
An example of this method (using CART3D) is described in arc.aiaa.org/doi/pdf/10.2514/6.2006-652.

January 23, 2014, 11:43	Artificial viscosity introduction	#1
osoucy New Member Olivier Soucy Join Date: Oct 2012 Location: Montreal, Canada Posts: 6 Rep Power: 14	Hi, I need to simulate the flow field around multi-blunt-body configurations. I'm only interested in flow velocities on a macro level since the solution will be interpolated on a coarser grid with cell sizes of about 5% of the characteristic length of each body. Typically, I solved the flow field using the Euler equations which provided enough accuracy for my specific needs. However, would it be possible to introduce some level of flow separation and turbulence effects without solving the full Navier-Stokes equations with a turbulence model? Is it possible to artificially locally introduces some viscous effects? Regards,

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January 28, 2014, 16:27		#2
hlk Senior Member Heather Kline Join Date: Jun 2013 Posts: 309 Rep Power: 14	Hello, One option to introduce viscosity without using a turbulence model would be to set the turbulence model to 'KIND_TURB_MODEL=NONE' and 'PHYSICAL_PROBLEM = RANS' in order to simulate viscous, laminar flow, but since you specifically mention turbulence and separation that may not be what you are looking for. An alternative that would avoid the RANS simulation, which unfortunately as far as I know has not been implemented with SU2, is to use a coupled Euler boundary-layer approach. An example of this method (using CART3D) is described in arc.aiaa.org/doi/pdf/10.2514/6.2006-652.