Fick Law in Ansys - chloride ingress

[wmpjrufg]

Hey everyone,

Could someone help me with a simple simulation example?

I need to model a 2D square surface (width × height) with circular inclusions (mesh isn’t an issue). The goal is to simulate chloride ingress into this surface over a 100-year time history, using Fick’s second law for diffusion.

I’ve searched online but couldn’t find a clear example. Does anyone have a minimal working example in APDL (ANSYS Mechanical) or PyAnsys for this case? Even a basic script would be incredibly helpful!

Thanks in advance!

[RobPasMue]

Hi @wmpjrufg! Thanks for reaching out. Forwarding this request to some of our library developers:

PyMAPDL: @germa89
PyMechanical: @dipinknair @koubaa

Not sure if we have similar examples on our codebase.

[germa89]

Thank you @RobPasMue for pinging me.

Querying the verification manual guide I found out the following VMs that seems to use diffusion.

It might be a good starting point if you are considering PyMAPDL as part of your workflow.

vm150.dat:

Title

VM150,Diffusion In A Plane Sheet

Info

Reference: Crank,J. The Mathematics of Diffusion.
2nd printing, Bristol: Oxford University Press

vm164.dat:

Title

VM164, Drying Of A Thick Wooden Slab (Diffusion)

Info

HEAT, MASS AND MOMENTUM TRANS., ROHSENOW AND CHOI, 2ND. PR., PAGE 392

vm220.dat:

Title

VM220,Electromigration Diffusion With Perfectly Blocking Diffusion Barrier

Info

USING COUPLED ELECTRIC DIFFUSION ELEMENTS
USING PURE DIFFUSION ELEMENTS - PLANE238

vm226.dat:

Title

VM226,1d Advection Diffusion Problem

Info

REFERENCE: ANY STANDARD FLUID DYNAMICS OR HEAT TRANSFER
TEXTBOOK WITH DIFFUSION EQUATION

• USING PURE DIFFUSION ELEMENTS - PLANE238
• USING COUPLED STRUCTURAL DIFFUSION ELEMENTS - PLANE223

vm276.dat:

Title

VM276,Constant Diffusion Flux In A Plane Sheet

Info

Reference: Crank,J. The Mathematics of Diffusion.
2nd printing, Bristol: Oxford University Press

vm299.dat:

Title

VM299,Sound Pressure Level In A Flat Room

Info

REFERENCE: A.BILLON,J.PICAUT,"INTRODUCING ATMOSPHERIC ATTENUATION
WITHIN A DIFFUSION MODEL FOR ROOM-ACOUSTIC PREDICTIONS"
MARCH 2008.

vm300.dat:

Title

VM300,Transmission Loss In Coupled-Room

Info

Reference: A.Billon,C.Foy,"Modeling The Sound Transmission Between
ROOMS COUPLED THROUGH WALLS BY USING A DIFFUSION MODEL"
MARCH 2008.

[wmpjrufg]

@germa89 what's this ID vm???.dat is a text model APDL. The ID doesn't a hyperlink.

About this books i found some these. Thank you so much.