Floating point exception error

jsb12136 · March 3, 2015, 11:51

Hi,all.
I am trying use Star ccm+ to simulate the rotation of a vertical axis water turbine with 3 blades. The model is regarded as a disk rotating in a stationary region. The results went diverge and "Floating point exception error". I use scalar scene to observe the flow velocity through the disk (which is the region of swept area ). I found that the velocity went sky high at the interface between the disk region and the stationary region. I have tried to change the mesh size, time step, interface boundary conditions, but nothing helps.

Please help me to break this ice so I can continue my study.

ggulgulia · March 3, 2015, 14:24

can you extenuate on the rotation motion method? Is it MRF, RBM or overset method. In case it's Rigid Body Motion (RBM) or Moving Reference Frame (MRF) you need to make sure that you've created the z-axis at the center of the disc

jsb12136 · March 3, 2015, 15:41

Quote:

Originally Posted by ggulgulia

can you extenuate on the rotation motion method? Is it MRF, RBM or overset method. In case it's Rigid Body Motion (RBM) or Moving Reference Frame (MRF) you need to make sure that you've created the z-axis at the center of the disc

No, its not rigid body motion. I have created z-axis and its a disk fluid region I made it rotating.

March 3, 2015, 11:51	Floating point exception error	#1
jsb12136 New Member Xiaosong Zhang Join Date: Oct 2014 Posts: 14 Rep Power: 12	Hi,all. I am trying use Star ccm+ to simulate the rotation of a vertical axis water turbine with 3 blades. The model is regarded as a disk rotating in a stationary region. The results went diverge and "Floating point exception error". I use scalar scene to observe the flow velocity through the disk (which is the region of swept area ). I found that the velocity went sky high at the interface between the disk region and the stationary region. I have tried to change the mesh size, time step, interface boundary conditions, but nothing helps. Please help me to break this ice so I can continue my study.

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March 3, 2015, 14:24		#2
ggulgulia Senior Member Gajendra Gulgulia Join Date: Apr 2013 Location: Munich Posts: 144 Rep Power: 13	can you extenuate on the rotation motion method? Is it MRF, RBM or overset method. In case it's Rigid Body Motion (RBM) or Moving Reference Frame (MRF) you need to make sure that you've created the z-axis at the center of the disc