# \*FILM together with \*TRANSFORM

**URL:** <https://calculix.discourse.group/t/film-together-with-transform/2866>\
**Category:** Analysis issues\
**Created:** [September 2, 2025, 10:31am UTC](https://calculix.discourse.group/t/film-together-with-transform/2866 "2025-09-02T10:31:41Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![binouli](https://avatars.discourse-cdn.com/v4/letter/b/5fc32e/32.png) [@binouli](https://calculix.discourse.group/u/binouli)\
**Post date:** [September 2, 2025, 10:31am UTC](https://calculix.discourse.group/t/film-together-with-transform/2866/1 "2025-09-02T10:31:41Z")

</div>

Hello,

has anyone tried to define \*FILM for convective heat transfer on the outer surface of a cylinder when the nodes of the surface are transformed in a cylindrical COS using \*TRANSFORM?

I am getting a strange temperature field if I try to run a coupled temperature-displacement calculation with the described boundary conditions. There might be some problems on the edges where the outer surface and the symmetry-planes meet, but I did expect the same temperature field as in the comparative calculation without transformed and constrained nodes in the outer surface.

 ![model](https://global.discourse-cdn.com/free1/uploads/calculix/original/2X/a/a0fc49cc63742f40ef0ba4c372f3306850573aa2.jpeg)

 ![temp_rad_free](https://global.discourse-cdn.com/free1/uploads/calculix/original/2X/4/4079ef88cbe4fdd01924326516e4a370b4387025.jpeg)

 ![temp_rad_const](https://global.discourse-cdn.com/free1/uploads/calculix/original/2X/b/b78d529a997537d373db54028ee58325a8a3ee36.jpeg)

The part in my input looks like this:

`**================================================`  
`** Temperature`  
`**================================================`  
`*BOUNDARY`  
`Nrin,11,11,363.15`  
`*FILM`  
`*INCLUDE,INPUT=routface.flm`  
`**================================================`  
`** Radial clamping`  
`**================================================`  
`*TRANSFORM,NSET=Nrout,TYPE=C`  
`0,0,0,0,0,1`  
`*BOUNDARY`  
`Nrout,1,1,0`

Is there a problem with the nodes of the faces used for \*FILM being transformed in a cylindrical COS?

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<div class="post-metadata">

**Author:** ![Calc\_em](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@Calc\_em](https://calculix.discourse.group/u/Calc_em)\
**Post date:** [September 2, 2025, 11:13am UTC](https://calculix.discourse.group/t/film-together-with-transform/2866/2 "2025-09-02T11:13:03Z")

</div>

`*TRANSFORM` should affect only mechanical DOFs. From Abaqus documentation:

> This option is used to specify a local coordinate system for displacement and rotation degrees of freedom at a node.

and:

> A nodal transformation is used to define a local coordinate system for:
> 
> - the definition of concentrated forces and moments;
> 
> - the definition of displacement and rotation boundary conditions;
> 
> - the definition of linear constraint equations; and
> 
> - the output of vector-valued quantities.

CalculiX is more vague regarding this:

> This option may be used to specify a local axis system X’-Y’-Z’ to be used for defining SPC’s, MPC’s and nodal forces.

Can you share the whole input file (you could upload it on some hosting website and paste the link here) ?

Abaqus doesn’t allow BCs in global or local coordinates to meet. CalculiX accepts this but you could try excluding the problematic edges from one BC.

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<div class="post-metadata">

**Author:** ![binouli](https://avatars.discourse-cdn.com/v4/letter/b/5fc32e/32.png) [@binouli](https://calculix.discourse.group/u/binouli)\
**Post date:** [September 2, 2025, 12:57pm UTC](https://calculix.discourse.group/t/film-together-with-transform/2866/3 "2025-09-02T12:57:41Z")

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Here is a link to the whole input files, one version with \*TRANSFORM and radial fixation, and the one without \*TRANSFORM that leads to the expected temperature field:

> **[Download pipe | LimeWire](https://limewire.com/d/6GNpU?lmwr-ftv=1)**
>
> Download pipe on LimeWire

I will try to exclude the edges where BCs in global and local coordinates meet, but in my understanding this should not affect the temperature calculation.