2D ship simulation

Andrrrew · July 8, 2016, 16:32

Hi to everyone!
I was wondering if someone can help me. I'm doing a 2D simulation of a ship model hull, in viscous (k-epsilon turbulence model) and unviscous case.
The result I want to achieve is the scalar field of velocity and pressure in the two cases and then extrapolate from an XY plot the numerical values of velocity and pressure along the hull, in order to create an Excel sheet.
In the unviscous case I managed to have the outcome, but, in the viscous case, when I set up the XY plot for the velocity (X-axis: field function----> position---> X; Y axis: field function---> velocity magnitude) the graphic gives zero velocity for all the lenght of the hull.
It's strange, because in the unviscous case the graphic is perfect.

(just for info, in the regions--> boundaries---> inlet, I selected, in the velocity node, a costant value (1.9 m/s) , not a field function and in the velocity option,I selected magnitude+direction)
Thanks to everyone who will help me!

marmot · July 11, 2016, 04:06

Perhaps I am missing something here, but I believe for the viscous case the velocity on the hull should be zero, if you want the velocity in the cell-center next to the hull, than create a user field function myCellVelX using $$Velocity[0] and click ignore boundary values and use that for your x-y plot

July 8, 2016, 16:32	2D ship simulation	#1
Andrrrew New Member Andrea Join Date: Jul 2016 Posts: 25 Rep Power: 9	Hi to everyone! I was wondering if someone can help me. I'm doing a 2D simulation of a ship model hull, in viscous (k-epsilon turbulence model) and unviscous case. The result I want to achieve is the scalar field of velocity and pressure in the two cases and then extrapolate from an XY plot the numerical values of velocity and pressure along the hull, in order to create an Excel sheet. In the unviscous case I managed to have the outcome, but, in the viscous case, when I set up the XY plot for the velocity (X-axis: field function----> position---> X; Y axis: field function---> velocity magnitude) the graphic gives zero velocity for all the lenght of the hull. It's strange, because in the unviscous case the graphic is perfect. (just for info, in the regions--> boundaries---> inlet, I selected, in the velocity node, a costant value (1.9 m/s) , not a field function and in the velocity option,I selected magnitude+direction) Thanks to everyone who will help me!

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July 11, 2016, 04:06		#2
marmot Senior Member kevin alun Join Date: Sep 2011 Location: Germany Posts: 106 Rep Power: 14	Perhaps I am missing something here, but I believe for the viscous case the velocity on the hull should be zero, if you want the velocity in the cell-center next to the hull, than create a user field function myCellVelX using $$Velocity[0] and click ignore boundary values and use that for your x-y plot