Hi
I have a problem with a weak contribution in a laser surface melting model:
My model takes into account solid-liquid phase change using an enthalpy-porosity technique and liquid phase volume forces using the Boussinesque Approximation (as in the Continuous Casting tutorial). The model also takes into account Marangoni Forces on the top surface of the material via a weak contribution boundary condition with an expression:
test(u)*gamma*Tx
where u is the velocity x component, gamma is a surface tension/ temperature gradient (a constant) and Tx is the Temperature in the x direction.
The resistive volume force term in the domain beneath the top surface serves to brake the fluid motion down to that of the material (the model is Eularian, meaning the material moves rather than the laser spot) when the material is solid, and allowing additional fluid motion within the molten area.
The trouble is, when the weak contribution is added to the top surface, it seems to allow additional fluid motion in areas where the material is supposed to be solid.
How can I tie the volume force term to the Marangoni weak contribution on the surface to ensure that any additional fluid motion is only allowed within the liquid phase of the material?
Many thanks in advance for your help
Dan
I have a problem with a weak contribution in a laser surface melting model:
My model takes into account solid-liquid phase change using an enthalpy-porosity technique and liquid phase volume forces using the Boussinesque Approximation (as in the Continuous Casting tutorial). The model also takes into account Marangoni Forces on the top surface of the material via a weak contribution boundary condition with an expression:
test(u)*gamma*Tx
where u is the velocity x component, gamma is a surface tension/ temperature gradient (a constant) and Tx is the Temperature in the x direction.
The resistive volume force term in the domain beneath the top surface serves to brake the fluid motion down to that of the material (the model is Eularian, meaning the material moves rather than the laser spot) when the material is solid, and allowing additional fluid motion within the molten area.
The trouble is, when the weak contribution is added to the top surface, it seems to allow additional fluid motion in areas where the material is supposed to be solid.
How can I tie the volume force term to the Marangoni weak contribution on the surface to ensure that any additional fluid motion is only allowed within the liquid phase of the material?
Many thanks in advance for your help
Dan