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Old   August 2, 2012, 22:54
Question herschel-bulkley model
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madan
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hey, guys, i am using the herschel-bulkley viscocity model to calculate the flow in a cavity. As the material property shown, when the shear stress is smaller than the yield stress, the "fluid" should keep static. Only the shear stess is large enough and exceeds the yield stress the fluid would flow. The problem is that in the simulation, i can not get the stagnent region even the shear stress is small. Does any of you know the reason? Or maybe the current model is limit and i need to develop my own model? who even studied the non-newtonian model can give me some clues? thanks a lot!
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Old   August 2, 2012, 23:07
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What are you setting as your nu_0 value?
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Old   August 3, 2012, 05:07
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Quote:
Originally Posted by kmooney View Post
What are you setting as your nu_0 value?
I think nu_0 should be set as large as possible and i did so too in fact.
Because for low strain rate, the material acts like a very viscous fluid (in fact it is almost "rigid").
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