Hi, guys
I have been learning the "bouyancy water" model of the "model libraries" these days , it's a simple model——temperature differential produces density variation that drives the bouyancy flow in water. But there are several questions bothers me.
1. In this case, the volume force of laminar flow is bouyancy caused by density variation. The model specifies volume force as F=-nitf1.rho*g_const. what's the meaning of nitf1.rho? does it mean Δρ? so the fomule above means F=-Δρg?
2. In the "material library", some properties of certain material are predefined functions. For example, Density rho is a function of temperature T,expresses as rho=rho(T).I want to know the exact fomula of rho(T), How to get that ?
3.About laminar flow(I'm not quite familier with hydromechanics)
In this case, two boundary conditions(Volume Force & Pressure Point Constraint) are necessary. So we need at least two boundary conditions to solve a fluid flow problem, is that correct? And what's the physical meaning of "Pressure Point Constraint"? It seems I can set pressure point constraint to either point of the geometry, and it would not affect the result. So what's the physical meaning of "Pressure Point Constraint"?
Thank you very much for your time !
I have been learning the "bouyancy water" model of the "model libraries" these days , it's a simple model——temperature differential produces density variation that drives the bouyancy flow in water. But there are several questions bothers me.
1. In this case, the volume force of laminar flow is bouyancy caused by density variation. The model specifies volume force as F=-nitf1.rho*g_const. what's the meaning of nitf1.rho? does it mean Δρ? so the fomule above means F=-Δρg?
2. In the "material library", some properties of certain material are predefined functions. For example, Density rho is a function of temperature T,expresses as rho=rho(T).I want to know the exact fomula of rho(T), How to get that ?
3.About laminar flow(I'm not quite familier with hydromechanics)
In this case, two boundary conditions(Volume Force & Pressure Point Constraint) are necessary. So we need at least two boundary conditions to solve a fluid flow problem, is that correct? And what's the physical meaning of "Pressure Point Constraint"? It seems I can set pressure point constraint to either point of the geometry, and it would not affect the result. So what's the physical meaning of "Pressure Point Constraint"?
Thank you very much for your time !