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IBAMR Users

What Is IBAMR?

IBAMR is a distributed-memory parallel implementation of the immersed boundary (IB) method with support for Cartesian grid adaptive mesh refinement (AMR). IBAMR is available from the IBAMR GitHub page.

What Is the IB Method?

The immersed boundary (IB) method is a general-purpose numerical method for simulating fluid-structure interaction. For general information about the IB method, see http://math.nyu.edu/faculty/peskin. For visualizations of simulations that use IBAMR, see http://cims.nyu.edu/~griffith.

What Is the IBAMR Users Google Group?

IBAMR Developers is a Google Group for users of the IBAMR software infrastructure.

0 selected

Teo Lara, … Aaron Barrett8

Sep 6

Scalar field conservation issue during AMR regridding (AdvDiff + INSStaggered)

Update: This is fixed!! turns out I was doing the integral incorrectly, I wasn't calling

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Scalar field conservation issue during AMR regridding (AdvDiff + INSStaggered)

Update: This is fixed!! turns out I was doing the integral incorrectly, I wasn't calling

Sep 6

hoover.a...@gmail.com, Boyce Griffith4

Sep 6

Using different element id in a single mesh

On Feb 25, 2025, at 10:57 AM, hoover.a...@gmail.com <hoover.a...@gmail.com> wrote: Hello,

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Using different element id in a single mesh

On Feb 25, 2025, at 10:57 AM, hoover.a...@gmail.com <hoover.a...@gmail.com> wrote: Hello,

Sep 6

Sagar G Nayak, Boyce Griffith4

Sep 6

Problem with constraintIB validation

Sagar — Did you ever sort out this pressure issue? (It is probably obvious, but I am working my way

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Problem with constraintIB validation

Sagar — Did you ever sort out this pressure issue? (It is probably obvious, but I am working my way

Sep 6

Shuang Shan, Boyce Griffith7

Sep 6

Add active scalar in ConstraintIB model

On May 21, 2025, at 7:45 AM, Shuang Shan <shanshu...@gmail.com> wrote: Dear Prof. Griffith

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Add active scalar in ConstraintIB model

On May 21, 2025, at 7:45 AM, Shuang Shan <shanshu...@gmail.com> wrote: Dear Prof. Griffith

Sep 6

JATIN RAJ, Boyce Griffith2

Sep 6

Reproducing 10-sphere Drafting–Kissing–Tumbling in ConstraintIB/falling_sphere

On Jun 24, 2025, at 12:58 PM, JATIN RAJ <jati...@tifrh.res.in> wrote: Hi everyone, I'm

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Reproducing 10-sphere Drafting–Kissing–Tumbling in ConstraintIB/falling_sphere

On Jun 24, 2025, at 12:58 PM, JATIN RAJ <jati...@tifrh.res.in> wrote: Hi everyone, I'm

Sep 6

Hong Nguyen, … Boyce Griffith15

Sep 6

How to add tracers to fluid

Great, thanks! Sagar, let us know if this works for you and/or if you have questions or problems. On

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How to add tracers to fluid

Great, thanks! Sagar, let us know if this works for you and/or if you have questions or problems. On

Sep 6

Sagar G Nayak, Amneet Bhalla3

Sep 6

Falling sphere doesn't fall if ForcingFunction is given

Can you put some print statements in your forcing functions to see when they are getting called?

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Falling sphere doesn't fall if ForcingFunction is given

Can you put some print statements in your forcing functions to see when they are getting called?

Sep 6

Sagar G Nayak, … Amneet Bhalla4

Sep 6

Unit of force in ConstraintIB ForceProjector

Thank you very much for the answers. It makes sense to me now. Thanks On Saturday, September 6, 2025

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Unit of force in ConstraintIB ForceProjector

Thank you very much for the answers. It makes sense to me now. Thanks On Saturday, September 6, 2025

Sep 6

SHfei Lee, Boyce Griffith2

Sep 5

Eddy Dissipation Models in eel3D

Sorry for the delay on this. I am not sure that I am exactly answering your question, but at present,

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Eddy Dissipation Models in eel3D

Sorry for the delay on this. I am not sure that I am exactly answering your question, but at present,

Sep 5

LIMING CHAO, Boyce Griffith2

Sep 5

Inquiry on CFL Number Sensitivity and Robust Parameter Settings in IBLevelSet Simulations

Sorry for the delay on this. Can you post a screenshot of the dynamics just before the simulation

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Inquiry on CFL Number Sensitivity and Robust Parameter Settings in IBLevelSet Simulations

Sorry for the delay on this. Can you post a screenshot of the dynamics just before the simulation

Sep 5

皮卡丘卡皮卡丘, Boyce Griffith3

Sep 5

Question on Simulating Crimping, Deployment, and Cardiac Cycle in TAVR Modeling

Sorry for the slow response. Some replies follow below: On Jul 15, 2025, at 1:28 AM, '皮卡丘卡皮卡丘

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Question on Simulating Crimping, Deployment, and Cardiac Cycle in TAVR Modeling

Sorry for the slow response. Some replies follow below: On Jul 15, 2025, at 1:28 AM, '皮卡丘卡皮卡丘

Sep 5

Aug 28

initial_angle_body_axis_0 in eel2d

Dear Prof. I set initial_angle_body_axis_0=0.5 in input file ,It runs but reports an error，I'd

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initial_angle_body_axis_0 in eel2d

Dear Prof. I set initial_angle_body_axis_0=0.5 in input file ,It runs but reports an error，I'd

Aug 28

JATIN RAJ, Boyce Griffith2

Aug 26

Where are the Navier-Stokes Equations Solved in the ConstraintIB/Falling_Sphere Example?

On Aug 26, 2025, at 8:01 AM, JATIN RAJ <jati...@tifrh.res.in> wrote: Hello all, I am trying to

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Where are the Navier-Stokes Equations Solved in the ConstraintIB/Falling_Sphere Example?

On Aug 26, 2025, at 8:01 AM, JATIN RAJ <jati...@tifrh.res.in> wrote: Hello all, I am trying to

Aug 26

Griffith, Boyce Eugene

Jul 28

semi-regular request for information on uses of IBAMR

Folks — We would appreciate any updates you might be able to share about your uses of the IBAMR

unread,

semi-regular request for information on uses of IBAMR

Folks — We would appreciate any updates you might be able to share about your uses of the IBAMR

Jul 28

Rebekah Saucier, Boyce Griffith2

Jul 19

CIB Porosity Model

On Jul 18, 2025, at 10:03 PM, Rebekah Saucier <basa...@gmail.com> wrote: Hello All, I am

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CIB Porosity Model

On Jul 18, 2025, at 10:03 PM, Rebekah Saucier <basa...@gmail.com> wrote: Hello All, I am

Jul 19

Laura Miller, Boyce Griffith8

Jul 19

Combined IBFE CIB example?

If the nodes are very far apart and you use nodal coupling it will act semi-porous. On Jul 19, 2025,

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Combined IBFE CIB example?

If the nodes are very far apart and you use nodal coupling it will act semi-porous. On Jul 19, 2025,

Jul 19

adka...@gmail.com, Wells, David3

Jul 9

autoibamr partial & update build

Hi David, Good to know, will re-run. It's a phenomenal tool and a huge time saver. Thank you,

unread,

autoibamr partial & update build

Hi David, Good to know, will re-run. It's a phenomenal tool and a huge time saver. Thank you,

Jul 9

Khem Gautam, … Wells, David7

Jul 2

Issue with Boost

Hi Khemraj, Yup, it's a problem with boost and recent versions of clang - the relevant patch hasn

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Issue with Boost

Hi Khemraj, Yup, it's a problem with boost and recent versions of clang - the relevant patch hasn

Jul 2

Jul 1

Help Improve Restart File Management in IBAMR: 1-minute Survey

Dear IBAMR users, I'm working on a summer project under the guidance of Dr.David Wells to

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Help Improve Restart File Management in IBAMR: 1-minute Survey

Dear IBAMR users, I'm working on a summer project under the guidance of Dr.David Wells to

Jul 1

陈奕纯, Boyce Griffith2

Jun 30

how does the REFINE_BOXES in input file work?

On Jun 17, 2025, at 5:34 AM, 陈奕纯 <a1185...@gmail.com> wrote: Here's the attribute from

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how does the REFINE_BOXES in input file work?

On Jun 17, 2025, at 5:34 AM, 陈奕纯 <a1185...@gmail.com> wrote: Here's the attribute from

Jun 30

adka...@gmail.com, … Wells, David9

Jun 24

linking/include from autoibamr

Hi Alex, I'm glad to hear things worked (and that the changes required for cmake are backwards-

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linking/include from autoibamr

Hi Alex, I'm glad to hear things worked (and that the changes required for cmake are backwards-

Jun 24

皮卡丘卡皮卡丘, Chang Wei3

Jun 20

Poisson equation solver not converging in C++, but solvable in MATLAB

Thank you so much for your prompt and insightful response! You're absolutely right, encapsulating

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Poisson equation solver not converging in C++, but solvable in MATLAB

Thank you so much for your prompt and insightful response! You're absolutely right, encapsulating

Jun 20

LIMING CHAO, Boyce Griffith4

Jun 4

Issue Running IBAMR on Supercomputer: "No available patch data component indices left" Error

On May 2, 2025, at 10:06 AM, LIMING CHAO <chaoli...@gmail.com> wrote: Dear Prof.Boyce, Thank

unread,

Issue Running IBAMR on Supercomputer: "No available patch data component indices left" Error

On May 2, 2025, at 10:06 AM, LIMING CHAO <chaoli...@gmail.com> wrote: Dear Prof.Boyce, Thank

Jun 4

Yufan Zhai, Boyce Griffith4

Jun 4

Differences in results between single-core and parallel computations

On Jun 4, 2025, at 4:37 AM, Yufan Zhai <yufan...@gmail.com> wrote: Thank you very much,

unread,

Differences in results between single-core and parallel computations

On Jun 4, 2025, at 4:37 AM, Yufan Zhai <yufan...@gmail.com> wrote: Thank you very much,

Jun 4

Oscar Jin, … Boyce Griffith4

May 27

How to disable calculating net moments

On May 27, 2025, at 10:52 AM, Oscar Jin <oscarj...@gmail.com> wrote: Hi Amneet, I'm

unread,

How to disable calculating net moments

On May 27, 2025, at 10:52 AM, Oscar Jin <oscarj...@gmail.com> wrote: Hi Amneet, I'm

May 27

Zhwe Sn, Boyce Griffith3

Apr 29

An error occurred while running example/IBFE/EX6

Thanks for your reply. your suggestion is correct. I successfully ran the case (FEIB/ex6) by reducing

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An error occurred while running example/IBFE/EX6

Thanks for your reply. your suggestion is correct. I successfully ran the case (FEIB/ex6) by reducing

Apr 29

陈奕纯, Boyce Griffith10

Apr 18

unit in the input file

Thanks! I'll try it asap 在2025年4月18日星期五 UTC+8 00:17:09<Boyce Griffith> 写道： On Apr 16, 2025,

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unit in the input file

Thanks! I'll try it asap 在2025年4月18日星期五 UTC+8 00:17:09<Boyce Griffith> 写道： On Apr 16, 2025,

Apr 18

Oscar Jin, Boyce Griffith2

Apr 15

Questions on target force functions

On Mar 31, 2025, at 5:16 PM, Oscar Jin <oscarj...@gmail.com> wrote: Hi, I'm a newbie to

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Questions on target force functions

On Mar 31, 2025, at 5:16 PM, Oscar Jin <oscarj...@gmail.com> wrote: Hi, I'm a newbie to

Apr 15

parees palkar, Boyce Griffith2

Apr 4

any tips for newbie

Pares — Have you taken a look at the examples? — Boyce On Apr 4, 2025, at 5:01 AM, parees palkar <

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any tips for newbie

Pares — Have you taken a look at the examples? — Boyce On Apr 4, 2025, at 5:01 AM, parees palkar <

Apr 4

Mar 25

Seg fault after regridding.

Hello, I'm encountering persistent issues with regridding (?) in IBFE. After a certain number of

unread,

Seg fault after regridding.

Hello, I'm encountering persistent issues with regridding (?) in IBFE. After a certain number of

Mar 25

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