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Messages - skhashan

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1
Thanks William,
In my case the small grid is unavoidable becuase I have a magnetic field with steep gradient near the lower wall of my micro-channel. This magnetic field dictaes a body force on the particle. Using a cell that is larger than the particle will results in un- resolved nagnetic force distribution therin. Always grateful to feedbacks

2
Fluent / Re: DPM: How to attach deistinctive property for a particle
« on: August 18, 2012, 11:23:31 PM »
William
I used three scalers. Compilation is sucsseful
I appreciate if yould check the way I am assigning the properties for three diameters (1e-6, 2.8e-6 and 4.5e-6 m)
Also, is there a better way to retrieve HMAG_p

Regards

DEFINE_DPM_SCALAR_UPDATE(magnetic_properties, cell, thread, initialize, p)
{
cphase_state_t *c=&(p->cphase);
   float MSAT_Myone,MSAT_M270,MSAT_M450;
   float FUNCH2, HMAG_p,CHI_p;
   MSAT_Myone=4.965e4;
   MSAT_M270=1.705e4;
   MSAT_M450=3.1595e4;
   HMAG_p=C_UDMI(P_CELL(p),P_CELL_THREAD(p),11);
   
if((P_DIAM(p)>=0.99e-6) && (P_DIAM(p)<=1.01e-6)){P_magnetic_sat(p)= MSAT_Myone,P_magnetic_chi(p)=1.4; }
if((P_DIAM(p)>2.79e-6) && (P_DIAM(p)<2.81e-6)){P_magnetic_sat(p)= MSAT_M270,P_magnetic_chi(p)=0.17; }
if((P_DIAM(p)>4.49e-6) && (P_DIAM(p)<4.51e-6)){P_magnetic_sat(p) = MSAT_M450,P_magnetic_chi(p)=0.25; }

if (HMAG_p < P_magnetic_sat(p)/P_magnetic_chi(p))
        {
       P_magnetic_fuch(p) =P_magnetic_chi(p);
        }
        else
        {
          P_magnetic_fuch(p)=P_magnetic_sat(p) / HMAG_p;
         }
C_UDMI(P_CELL(p),P_CELL_THREAD(p),13)=P_magnetic_fuch(p);
}

3
Fluent / Re: DPM: How to attach deistinctive property for a particle
« on: August 17, 2012, 05:53:02 PM »
great william, you are making me closer to solve the problem
However,  to make my problem more understandable i must say that these properties are supposed to be different for each injected particel size.  I  am injecting three different particle diameters, each particel size is supposed to have its own distinctive magnetic saturation and magnetic susceptibility. Appreciate your help

4
Fluent / Re: DPM: How to attach deistinctive property for a particle
« on: August 16, 2012, 05:54:37 PM »
Thanks Wiiliam. But here I am talking about a property that is not a standard macro

5
Fluent / DPM: How to attach deistinctive property for a particle
« on: August 14, 2012, 08:24:10 PM »
Hello all,
Does any one know how to attach a assign a particel with a distinctive property. The diameter, mass, density, temerature, etc.  are assigned automatically to each particel type  (example P_DIAM(p) for diameter). But, I am interested in assigning other destinctive properties like magnetic saturation and magnetic susceptibility. Appreciate any help

6
Hi everyone, I have just joined your nice Forum

I am simulating the magnetic capture of micromagnetic particels carried by liquid flowing through a microchannel. The Fluent theory manual lacks some important issues related to the grid-to-particle  sizes. The micro scale flow and the high gradient of the external magnetic force require me to resolve the grid (2D) into a comparable and even smaller than the 2D area of a particel (dp=1e-6m).
I will highly appreciate clarifying the constraint (if any) on the minimum cell size for both Eulerian-lagrangian model and for DPM model (and DDPM if possible)

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