Magnetic Nanofluid
 

Hi everyone. I work about ferrohydrodynamic in COMSOL. But I have some problem. I can not sol ve this 3 physic in program. First of all I open study and this study is 2 step. First step include magnetic field no current, second step includrs magnetic field no current, laminar flow and heat transfer in fluid. But it gives this error : Stationary solver 2 (sol 4/s2) undefined value found. Detail: Undefined value found in the equation residual vector. There are 6 degree of freedom giving NaN/Inf in the vector for the variable comp1.p. at coordinates: ........
If you help me for this problem, it would be amazing for me. Have a nice day.

Hello,


Have you deal with it or not?
I have worked on the simulation of magnetohydrodynamic systems in COMSOL.. I think it would be helpful for you.. you have to add a force in the Laminar flow module not forget that

I did something but I have some problem, it can not increase heat transfer, there are negative effect. I try to solve now.I use heat source and volume force formulation. Which formula can I use in only magnetic volume force?
Also I try to find magnetization formula,
M =K' H (Tc-T)
How can I find K' value for Fe3O4-water nanofluid?