Dynamic contact angle calculation in multiphaseInterFoam

rajeshchem · November 23, 2013, 02:57

Hi,

Could anyone tell me the implementation of dynamic contact angle in multiphaseInterfoam solver?

There are four contact angle values to be input for multiphaseInterFoam, via.. equlibrium contact angle, Utheta, Advancing contact angle, Receding contact angle.

I found some details , how contact angle is being calculated in multiphaseInterFoam as follows,
θ = (θA − θR ) ∗ tanh(uwall/uθ)

my question is when i use no slip boundary condition, u wall is zero then the theta on left hand side is also becomes zero. Then how the contact angle effect is being imposed in multiphaseinterFoam under no slip BC. First of all, is this solver requires all four contact angle to be defined?

Please help me to understand this contact angle issue.

laurent98 · January 6, 2014, 20:35

hi,
i'am also looking for experimental values for water/air ... anybody can help?
thank very much be advance LL

rajeshchem · January 31, 2014, 08:52

Could anyone reply to my query?

dweaver123 · December 23, 2022, 15:00

If you look above the calculation for theta you will see that the patchInternalField() function is used to sample the internal field values. This is then subtracted to wall velocity (you specify no-slip and so it is equal to zero). Therefore uWall will not be zero like you suggested. I cannot find this model in literature anywhere though and it's concerning.

November 23, 2013, 02:57	Dynamic contact angle calculation in multiphaseInterFoam	#1
rajeshchem New Member Rajesh Join Date: Jul 2012 Location: New Delhi Posts: 8 Rep Power: 14	Hi, Could anyone tell me the implementation of dynamic contact angle in multiphaseInterfoam solver? There are four contact angle values to be input for multiphaseInterFoam, via.. equlibrium contact angle, Utheta, Advancing contact angle, Receding contact angle. I found some details , how contact angle is being calculated in multiphaseInterFoam as follows, θ = (θA − θR ) ∗ tanh(uwall/uθ) my question is when i use no slip boundary condition, u wall is zero then the theta on left hand side is also becomes zero. Then how the contact angle effect is being imposed in multiphaseinterFoam under no slip BC. First of all, is this solver requires all four contact angle to be defined? Please help me to understand this contact angle issue.

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January 6, 2014, 20:35		#2
laurent98 Member laurentL Join Date: Oct 2011 Location: new caledonia Posts: 73 Rep Power: 15	hi, i'am also looking for experimental values for water/air ... anybody can help? thank very much be advance LL

January 31, 2014, 08:52		#3
rajeshchem New Member Rajesh Join Date: Jul 2012 Location: New Delhi Posts: 8 Rep Power: 14	Could anyone reply to my query?

December 23, 2022, 15:00		#4
dweaver123 New Member Dustin Weaver Join Date: Dec 2016 Posts: 4 Rep Power: 9	If you look above the calculation for theta you will see that the patchInternalField() function is used to sample the internal field values. This is then subtracted to wall velocity (you specify no-slip and so it is equal to zero). Therefore uWall will not be zero like you suggested. I cannot find this model in literature anywhere though and it's concerning.