Learning Forum

[Wazawaki]

Hello, nI've modeled the deformation of the red blood cell, but not sure how to calculate the change of the axial diameter after deformation. nThis is before deformation:nAfter deformation :nThank you for the help!nn

[peteroznewman]

nThe center profile started like this, but you are using symmetry, so you only see the top half.nThis is what your result looks like:nI don't think you want the center walls passing through each other do you? I suggest you add frictional contact with a center plane to prevent that.n

[peteroznewman]

nOr you might want to abandon a symmetric boundary condition and have a full model. Then you could have non-symmetric results.nnn

[Wazawaki]

nHi, Thank you for the help. I'm thinking to go with the first suggestion adding the frictional contact with a center plane. I'm struggling with how to go about doing this, would you be able to guide me more on this?nThank you again for the help!n

[peteroznewman]

nWhat version of ANSYS are you using? Newer versions allow you to make simple geometry in Mechanical. In older versions, open the Geometry editor and make a surface much larger than the size over which the cell might stretch. Bring that surface into Mechanical. Set the behavior of the surface to Rigid. Select an Edge and use Remote Displacement to hold the surface fixed. Insert a Frictionless Contact between the surface and the inner face of the cell.n

[Wazawaki]

nI'm using the 2020 version of Ansys, will apply this to my model now. Will the material of the surface have an impact on the results? nReally appreciate the help!n

[peteroznewman]

No, the material for the rigid surface is unimportant.n

[Wazawaki]

nThe model now stops when the two halves meet! Would you know how to measure the axial and transverse diameters after deformation?nThank you!n

[peteroznewman]

nI assume the model plane of symmetry is at the XZ plane, so that the center plane has a coordinate of Y=0. I assume all the nodes are on the positive side of the Y axis.nPlot the Y Deformation. You can export that as a CSV file with the coordinates of the nodes.nNow you will have a file with five columns as shown belownID, X, Y, Z, YdeformnMake a new column TransverseDiameter = 2*(Y-Ydeform)nn

[Wazawaki]

nThank you for all the help! One last question, how do I go about plotting the Y deformation? Have been struggling to figure it out.nn

[peteroznewman]

nn

[Wazawaki]

nBrilliant, thank you for all the helpn